Sidebar views should be displayed as collapsible folders like in Library tree, not as wide panels

Explain the problem as you see it:

Currently, views like Landing page, Process, or Read are rendered in the sidebar as wide panels that take up half of the height, instead of being shown as structured collapsible folders, like in the Library.

Why is this a problem for you?

It breaks the visual and spatial consistency of the interface. When I’m navigating information, I expect a compact, nested structure like in Library, where I can quickly collapse or expand sections. Wide panels interrupt my workflow, especially when I’m managing multiple views or switching between them.

Suggest a solution:

Render all sidebar views in the same tree structure as used in the Library section — with collapsible folders. Reserve full-panel display only for views that contain actual content, not structural navigation. This will make the experience more predictable and keep navigation tidy.