After the One UI 7 update, the whole UI feels super smooth, battery backup is better than in One UI 6.1, and the heating issue is also resolved. But there are a few minor bugs; these are not a problem for now, and they may be fixed in the next update...

One UI 7.0 stable update will be released for galaxy A35 in February

I checked it by using a third party application "Checkfirm"

Make sure you have updated your googleplay system update to the latest version and check for the system update again.I hope this will help.