The old UI wont come back. I dont know for sure but I think you can turn off that pre/post game pop-up stuff in Settings > Board & pieces > Board effects (it is for the web version, the path in the apps may differ)
NEED OLD WEB UI - please change it to the old web ui chess.com
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was wondering why everything was curved and how when I finish I a game it automatically does the analysis. The old one was much better. Does anyone know how to get back the old Ui?