Is it possible for Layers not to collapse when selecting objects on canvas? I know that one of new features was to make it like that for Groups. Is there option for Layers to do the same or need to wait for devs to implement it?

When working with imported PDFs (lots of layers groups, objects outside of them), it triples clicks I do when arranging the scene ....

Not seeing that behavior here.

1. Describe your OS (your computer's Operating System: Mac/Windows/Linux/etc. & version).
2. Describe if Inkscape was newly installed, or upgraded from an earlier version.
3. Describe the version of Inkscape and the installer you used (the file you downloaded from the website: .msi/.exe/.zip/other ). 

1. PopOs(Ubuntu 22.04)

2. Newly installed, Flatpak

3. Latest stable 1.3.2

Here is the video showing problem.

https://drive.google.com/file/d/1nAT3tawasRAQbfeeeeSuMkCxwDUFjYTg/view?usp=drive_link

I used probably wrong word, I meant to not expand.

Maybe this:

Faantastic! Thanks!