Unable to collapse the left side panel in teams anymore

Yes indeed. I'm on a PC and my employer (a company of over 5k employees) manages everything on the device so I have no administrative access and would be laughed at for submitting a ticket for something like this. It's up to Microsoft to provide a fix via an update - otherwise we are stuck with something that serves no purpose other than to take up space.

NONE of the fixes address or are applicable to the web-based version.

Please vote for the feature request!!

Ability to collapse Teams list panel Thx

In case it helps, my org's helpdesk advised clearing cache - which worked for me - via these steps:

1. Force close Teams completely > then using the file explorer go here and delete all files and folders in these locations:
2. For NEW Teams
   C:\Users[username]\AppData\Local\Packages\MSTeams_8wekyb3d8bbwe\LocalCache\Microsoft\MSTeams
3. For OLD Teams
   C:\Users[username]\AppData\Roaming\Microsoft\Teams

NOTE this will wipe out any avatars or custom backgrounds, although my settings seem to be intact.

I was having the same issue but was able to resolve it pretty easily! Close out of Teams > Navigate to Settings > Apps > Installed Apps > Locate Microsoft Teams > Advanced Options under the 3-dots > scroll down to Reset and select it. Easier and quicker than doing an uninstall/reinstall.

Thank you this fixed the non-collapsing left sidebar.

And yes, the chats remained there with pinned people and so on. Only thing that was reset was my Teams settings and most noticeably the teams color theme and notification settings. And my second organization account was removed from the list but you could easily add it back. Small price to pay for peace of mind and stopping the hindrance to your workflow.