Happening to me too on Manjaro KDE, same Steam beta build date. Opening the Friends-window also makes user interface element size larger in the whole client for me.
Hello, per "Fixed duplicate friends list windows" in the 2022-11-01 Steam client beta update, please update your Steam client and retest this issue.
The main issue on start seems fixed, although while testing i noticed another way to reproduce the issue:


Then the window sometimes stays when i sign in again, sometimes it crashes and stays blank
Hello, per "Fixed duplicate friends list windows" in the 2022-11-01 Steam client beta update, please update your Steam client and retest this issue.
Both of the problems are now gone for me.
Seems fixed for me now with the latest version could not reproduce it anymore
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Your system information
Please describe your issue in as much detail as possible:
When starting steam the friendlist window is opened twice
Steps for reproducing this issue: