barbaraok wrote:
I can't open Mail Preferences any longer, just get the spinning ball and have to use Force Quit to get out. This occurs whether or not I have looked at any mail. I have put off upgrading to 11.3 or 11.4 because Mail seems to be getting worse with each new upgrade.
Well—
it would be the recommended course of action, to upgrade the macOS and see then where you stand.
How to update the software on your Mac - Apple Support
To trouble shoot further you can:
—Try a SafeBoot https://support.apple.com/en-us/HT201262
Takes noticeable longer to get to the login screen, does a 5 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc.
Login and test. Reboot as normal. Caches get rebuilt automatically.
In Safe mode third party system modifications and system accelerations are disabled, it removes malware, etc hampering smooth operation, however a reboot will put it back to normal mode.
This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.
—Test issue in another user (or guest user) account https://support.apple.com/guide/mac-help/set-up-other-users-on-your-mac-mtusr001/mac
This will tell you if it a universal issue or isolated to your user/admin account.
Uninstall all third party apps that are Cleaners/Optimizers/VPN/Anti-Virus