Trello for Mac List collapse does the opposite.

[Craig Macdonald _Primo_]

Collapsing lists in my Trello app on Mac has started expanding the list title to full window width rather than collapsing it to a vertical title like it should. I'm pretty sure it happened after I "tried the Beta experience", but hasn't reverted to the usual behaviour on switching back.

[Mat]

Hi Craig, 

Sorry to hear that you're having issues with collapsing lists! I tried to do the same thing on my Trello Desktop app on Mac while on Beta but I am unable to replicate it to go to full window width.

Could you please try the following troubleshooting steps here and see if it resolves your issue:
https://support.atlassian.com/trello/docs/troubleshooting-for-the-desktop-app-windows-and-macos/ 

I hope this helps, but let us know if you have any questions!
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[Craig Macdonald]

I tried the trouble shooting tips above, but the problem still persists.
see attached pics for an example of the issue.