Sometimes when I try to erase deleted messages in all accounts in Mail.app by using the keyboard shortcut command-shift-delete, I get an error beep when I press "return" to select the "erase" option in the "Are you sure?" dialog box. I can use the mouse pointer to click on "erase" with no problems, but I have been using "return" for years with that dialog box. If I quit Mail and relaunch it, the problem goes away--temporarily. Restarting my Mac does no good. I never had this problem before 26.5.