A fairly consistently reproduceable point is in the Multiplayer options menu in the editor, so.
1920x1080 Borderless Windowed < presumably important.
Open the Multiplayer window in the top bar.
Scroll down to the Required Trait option
Click the option, if you fail to open the listing then congratulations.
Shift the window very slightly (this suddenly decided to fail for me) to (maybe) temporarily resolve the issue. Otherwise, try scrolling up a bit.