Clarification on fsd/insignificant-slice rule in Steiger

[chertik77]

I'm doing a todo app, I have 4 pages and my main page is dashboard. I've got the structure similar to something like this:

src
├── features
│   ├── card
│   │   ├── add-card
│   │   ├── edit-card
│   │   └── delete-card
│   ├── column
│   │   ├── add-column
│   │   ├── edit-column
│   │   └── delete-column
│   └── user
│       ├── change-theme
│       └── toggle-sidebar
├── widgets
│   ├── header
│   ├── sidebar
│   └── kanban-board
│       ├── filters
│       ├── card
│       │   ├── CardList.tsx
│       │   └── CardListItem.tsx
│       ├── column
│       │   ├── ColumnList.tsx
│       │   └── ColumnListItem.tsx
│       └── board
└── pages
    ├── welcome
    ├── signin
    ├── signup
    └── dashboard

These features are not reusable, cause it all happens on the same page, steiger suggests me move all slices to the layer above, so to the kanban-board widget, doing that, my widget would become a complete mess with a lot of ui and lib folders. Do you have any suggestions how i can accomplish this?

And also features like toggle-sidebar, and change-theme - it works only in one place, but moving everything to widgets would become unreal to maintain.