Still happening with version 1769025840, which is now the current version in both the stable and beta branch, leaving me with no workaround.
My issue was resolved, try removing old / broken simlinks, in your steam directory
I tried it with a completely fresh Steam directory, but that didn't help. The problem is still happening with beta 1770329915.
I have a very similar situation.
Client version 1774577504
I've noticed that actions like entering and exiting Big Picture mode keeps the window maximised, and restore it to maximised state from what I described in the step 2.
A small demonstration video of what is happening:
https://github.com/user-attachments/assets/f4854712-6fca-40ca-9c37-6fb3988df454
Nothing extracted yet.
Your system information
Please describe your issue in as much detail as possible:
When the maximized main window is closed and re-opened without exiting Steam completely, it doesn't stay maximized and instead reverts to its default size. I would expect it to still be maximized after re-opening it, which used to be the case in the past. If I switch to the stable branch (version 1766451605), it stays maximized after re-opening, as expected. This could be related to #12629, but the details are different.
Steps for reproducing this issue: