Is it just me? The button doesn't work for me. It changes between "Expand All ..." and "Undo ...", but it doesn't have any effect on the actual nodes.

This is ridiculous, how is this not worked on after 7 years?? This notification is SO annoying that I am actually considering removing my premium access.

As for an example how people use pinned tabs, here is how I use pinned tabs and groups for managing work related tabs.
1) first pinned tab is the Activity board or open tickets

2) second pinned tab is time tracking tool

3) then I have a group with my open, currently working on tickets

4) then normal tabs with whatever other stuff

Second window is as follows
1) pinned development tab localhost:4000/admin

2) pinned development tab localhost:3000

3) grouped hosted deployment previews

4) normal tabs anything else

The issue:

Notice how last tab is not pinned.

1) I pinned 3 tabs
2) close and restore

Notice how last tab is not pinned.

Reopening a window with tab groups results in the following.

1) Before closing
2) After reopening

This is a very important feature for me.

Reopening a window with tab groups results in the following.

1) Before closing
2) After reopening

This is a very important feature for me.