I upgraded to Catalina this afternoon and it has some major problems associated with the Magic Mouse. In Safari there is no smooth scrolling - it is all jerky, however in Mail it scrolls smoothly. Secondly when you click on a button it seems to bring up an options menu that I can’t see how to get rid of, instead of closing a tab it comes up with an option to pin the tab, or close the tab etc. You have to click up to three times on the button before it closes etc. It seems everything you click on comes with an options menu. It is exceedingly annoying. If I can’t fix it I am going to use Time Machine tomorrow to revert back to the previous version of Mac OS.
21" iMac 2017