diff --git a/frontend/src/cljs/imas_seamap/map/events.cljs b/frontend/src/cljs/imas_seamap/map/events.cljs
index 2da23839..e7121d53 100644
--- a/frontend/src/cljs/imas_seamap/map/events.cljs
+++ b/frontend/src/cljs/imas_seamap/map/events.cljs
@@ -580,8 +580,7 @@
 (defn toggle-legend-display [{:keys [db]} [_ {:keys [id] :as layer}]]
   (let [db (update-in db [:layer-state :legend-shown] #(if ((set %) layer) (disj % layer) (conj (set %) layer)))
         has-legend? (get-in db [:map :legends id])
-        rich-layer  (enhance-rich-layer (layer->rich-layer layer db) db)
-        has-cql-filter-values? (get-in rich-layer [:controls :values])]
+        rich-layer  (enhance-rich-layer (layer->rich-layer layer db) db)]
     {:db         db
      :dispatch-n [[:maybe-autosave]
                   ;; Retrieve layer legend data for display if we don't already have it or aren't
@@ -589,8 +588,7 @@
                   (when-not has-legend?
                     [:map.layer/get-legend layer])
                   ;; Retrieve rich layer cql filter data if we don't already have it
-                  (when (and rich-layer (not has-cql-filter-values?))
-                    [:map.rich-layer/get-cql-filter-values rich-layer])]}))
+                  [:map.rich-layer/get-cql-filter-values rich-layer]]}))
 
 (defn zoom-to-layer
   "Zoom to the layer's extent, adding it if it wasn't already."
@@ -764,16 +762,21 @@
                   [:map.rich-layer/get-cql-filter-values rich-layer])                                 ; then get them
                 [:maybe-autosave]]})
 
-(defn rich-layer-get-cql-filter-values [{:keys [db]} [_ {:keys [id controls] :as rich-layer}]]
-  (if (seq controls)
-    {:http-xhrio
-     {:method          :get
-      :uri             (get-in db [:config :urls :cql-filter-values-url])
-      :params          {:rich-layer-id id}
-      :response-format (ajax/json-response-format)
-      :on-success      [:map.rich-layer/get-cql-filter-values-success rich-layer]
-      :on-failure      [:ajax/default-err-handler]}}
-    {:dispatch [:map.rich-layer/get-cql-filter-values-success rich-layer {"values" {} "filter_combinations" []}]}))
+(defn rich-layer-get-cql-filter-values [{:keys [db]} [_ {:keys [id] :as _rich-layer}]]
+  (let [; Check if the new displayed layer is a rich layer, and if it has cql filter values that need to be fetched
+        {:keys [displayed-layer]} (enhance-rich-layer (first-where #(= (:id %) id) (get-in db [:map :rich-layers :rich-layers])) db)
+         displayed-rich-layer (layer->rich-layer displayed-layer db)
+        has-cql-filter-values? (:values (first (get-in db [:map :rich-layers :async-datas (:id displayed-rich-layer) :controls])))]
+    (when-not has-cql-filter-values? ; If the displayed layer doesn't have cql filter values, fetch them
+      (if (seq (:controls displayed-rich-layer))
+        {:http-xhrio
+         {:method          :get
+          :uri             (get-in db [:config :urls :cql-filter-values-url])
+          :params          {:rich-layer-id (:id displayed-rich-layer)}
+          :response-format (ajax/json-response-format)
+          :on-success      [:map.rich-layer/get-cql-filter-values-success displayed-rich-layer]
+          :on-failure      [:ajax/default-err-handler]}}
+        {:dispatch [:map.rich-layer/get-cql-filter-values-success displayed-rich-layer {"values" {} "filter_combinations" []}]}))))
 
 (defn rich-layer-get-cql-filter-values-success [db [_ {:keys [id] :as _rich-layer} {:strs [values filter_combinations]}]]
   (let [values (keywordize-keys values)]
@@ -794,7 +797,7 @@
         db (assoc-in db [:map :rich-layers :states id :alternate-views-selected] (get-in alternate-views-selected [:layer :id]))
         {:keys [timeline]
          new-slider-label :slider-label}
-        (enhance-rich-layer rich-layer db)
+        (enhance-rich-layer (first-where #(= (:id %) id) (get-in db [:map :rich-layers :rich-layers])) db)
 
         ; Find a value on the new alternate view's timeline that matches the old
         ; selected value.
@@ -810,7 +813,8 @@
      :dispatch-n
      [(when
        (and alternate-views-selected (not (get-in db [:map :legends (get-in alternate-views-selected [:layer :id])])))
-        [:map.layer/get-legend (:layer alternate-views-selected)])
+        [:map.layer/get-legend (:layer alternate-views-selected)]) 
+      [:map.rich-layer/get-cql-filter-values rich-layer]
       [:maybe-autosave]]}))
 
 (defn rich-layer-timeline-selected [{:keys [db]} [_ {:keys [id layer] :as _rich-layer} timeline-selected]]
diff --git a/frontend/src/cljs/imas_seamap/map/utils.cljs b/frontend/src/cljs/imas_seamap/map/utils.cljs
index a5938f43..36ec73f1 100644
--- a/frontend/src/cljs/imas_seamap/map/utils.cljs
+++ b/frontend/src/cljs/imas_seamap/map/utils.cljs
@@ -428,9 +428,9 @@
         layer  (first-where #(= (:id %) layer-id) layers)]
     (assoc timeline :layer layer)))
 
-(defn control->value [{:keys [cql-property controller-type default-value] :as _control} {:keys [id] :as _rich-layer} db]
+(defn control->value [{:keys [cql-property controller-type default-value] :as _control} {:keys [id] :as _rich-layer} {alternate-view-rich-layer-id :id :as _alternate-view-rich-layer} db]
   (let [value  (get-in db [:map :rich-layers :states id :controls cql-property :value])
-        values (get-in db [:map :rich-layers :async-datas id :controls cql-property :values])]
+        values (get-in db [:map :rich-layers :async-datas (or alternate-view-rich-layer-id id) :controls cql-property :values])]
     (or
      value
      default-value
@@ -438,13 +438,13 @@
 
 (defn control->value-map
   "Returns a map of the control's cql-property to its value."
-  [{:keys [cql-property] :as control} rich-layer db]
-  (let [value (control->value control rich-layer db)]
+  [{:keys [cql-property] :as control} rich-layer alternate-view-rich-layer db]
+  (let [value (control->value control rich-layer alternate-view-rich-layer db)]
     {cql-property value}))
 
-(defn control-is-default-value? [{:keys [cql-property controller-type default-value] :as control} {:keys [id] :as rich-layer} db]
-  (let [value  (control->value control rich-layer db)
-        values (get-in db [:map :rich-layers :async-datas id :controls cql-property :values])]
+(defn control-is-default-value? [{:keys [cql-property controller-type default-value] :as control} {:keys [id] :as rich-layer} {alternate-view-rich-layer-id :id :as alternate-view-rich-layer} db]
+  (let [value  (control->value control rich-layer alternate-view-rich-layer db)
+        values (get-in db [:map :rich-layers :async-datas (or alternate-view-rich-layer-id id) :controls cql-property :values])]
     (boolean
      (or
       (= value default-value)
@@ -467,28 +467,31 @@
       (filterv #(= (get % cql-property) value) filter-combinations))
     filter-combinations))
 
-(defn- ->control [{:keys [cql-property] :as control} {:keys [id controls] :as rich-layer} db]
-  (let [values (get-in db [:map :rich-layers :async-datas id :controls cql-property :values])
-        value  (control->value control rich-layer db)
+(defn- ->control [{:keys [cql-property] :as control} rich-layer {alternate-view-rich-layer-id :id :as alternate-view-rich-layer} db]
+  (let [values (get-in db [:map :rich-layers :async-datas alternate-view-rich-layer-id :controls cql-property :values])
+        value  (control->value control rich-layer alternate-view-rich-layer db)
         other-controls
         (->>
-         controls
+         (or (:controls alternate-view-rich-layer) (:controls rich-layer))
          (remove #(= cql-property (:cql-property %)))
-         (map #(assoc % :value (control->value % rich-layer db))))
-        filter-combinations (get-in db [:map :rich-layers :async-datas id :filter-combinations])
+         (map #(assoc % :value (control->value % rich-layer alternate-view-rich-layer db))))
+        filter-combinations (get-in db [:map :rich-layers :async-datas alternate-view-rich-layer-id :filter-combinations])
         valid-filter-combinations (reduce #(remove-incompatible-combinations %1 %2) filter-combinations other-controls)
-        valid-values (set (map #(get % cql-property) valid-filter-combinations))]
+        valid-values (set (map #(get % cql-property) valid-filter-combinations))
+        values
+        (mapv
+         (fn [value]
+           (hash-map
+            :value (or value "None") ; nil is substituted with "None" for the dropdown
+            :valid? (boolean (some #(= % value) valid-values))))
+         values)
+        
+        values (if (and value (not (first-where #(= (:value %) value) values))) (conj values {:value value :valid? false}) values)]
     (assoc
      control
-     :values
-     (mapv
-      (fn [value]
-        (hash-map
-         :value (or value "None") ; nil is substituted with "None" for the dropdown
-         :valid? (boolean (some #(= % value) valid-values))))
-      values)
+     :values values
      :value  value
-     :is-default-value? (control-is-default-value? control rich-layer db)
+     :is-default-value? (control-is-default-value? control rich-layer alternate-view-rich-layer db)
      :cql-filter (control->cql-filter control value))))
 
 (defn rich-layer->controls-value-map
@@ -498,9 +501,9 @@
    * `db: :seamap/app-state`: Seamap app state
 
    Example: `rich-layer` -> `{\"cql-property1\" 100 \"cql-property2\" 200}`"
-  [rich-layer db]
+  [rich-layer alternate-view-rich-layer db]
   (s/assert :map.rich-layers/rich-layer rich-layer)
-  (apply merge (map #(control->value-map % rich-layer db) (:controls rich-layer))))
+  (apply merge (map #(control->value-map % rich-layer alternate-view-rich-layer db) (:controls rich-layer))))
 
 (defn enhance-rich-layer
   "Takes a rich-layer and enhances the info with other layer data."
@@ -523,7 +526,8 @@
         timeline-selected         (first-where #(= (get-in % [:layer :id]) timeline-selected-id) timeline)
         slider-label              (or (:slider-label alternate-view-rich-layer) slider-label)
 
-        controls                  (mapv #(->control % rich-layer db) controls)
+        controls                  (mapv #(->control % rich-layer alternate-view-rich-layer db) (if alternate-view-rich-layer (:controls alternate-view-rich-layer) controls))
+
         cql-filter                (->>
                                    controls
                                    (map :cql-filter)
@@ -590,7 +594,18 @@
          layers)
         displayed-layers
         (map #(rich-layer->displayed-layer % db) active-layers)
-        displayed-rich-layer-filters (mapv #(rich-layer->controls-value-map (layer->rich-layer % db) db) displayed-layers)
+
+        displayed-rich-layer-filters
+        (mapv
+         (fn [displayed-layer]
+           (let [rich-layer (layer->rich-layer displayed-layer db)
+
+                 alternate-view-rich-layer-id (get-in db [:map :rich-layers :layer-lookup (:alternate-views-selected rich-layer)])
+                 alternate-view-rich-layer-id (when-not (= alternate-view-rich-layer-id id) alternate-view-rich-layer-id)
+                 alternate-view-rich-layer    (first-where #(= (:id %) alternate-view-rich-layer-id) (get-in db [:map :rich-layers :rich-layers]))]
+             (rich-layer->controls-value-map rich-layer alternate-view-rich-layer db)))
+         displayed-layers)
+
         active-layers-metadata (map (fn [layer] (:metadata (first-where #(= (:layer %) (:id layer)) (:layers dynamic-pill)))) active-layers)] ; get the metadata for the active layers, forming a list of the same arity
     (->
      dynamic-pill