I assume you've tried disabling ReSharper to check that it is doing the auto formatting? Are you running the latest version of ReSharper? Is it the same on all projects, even a new one? What language(s) are you using? You could try resetting your ReSharper settings.
– Piers MyersFeb 08 '21 at 10:13
Also, check that there are no 3rd party plugins installed into Visual Studio, which can force ReSharper formatting to run like the "ReSharper Format On Save" plugin https://marketplace.visualstudio.com/items?itemName=MackenzieZastrow.ReSharperFormatOnSave
– Alexander KurakinFeb 09 '21 at 16:37