hey, when I double click to open mail the screen won't open up but it says it is open and won't let me quick the page, even though the page isn't open

From the   Apple Menu Try Force Quit Or

Restart or Shut Down and you don’t want app windows that are open to reopen when your Mac restarts, so deselect “Reopen windows when logging back in.”

See: Log out, sleep, wake, restart, or shut down your Mac - Apple Support and How to force an app to quit on your Mac - Apple Support

Since the last software update, when I open the Mail app, a blank email appears and I cannot get to emails. I have to shut the mail app to make it go away. Shutting down my laptop and starting it back up does not fix the problem. Is there a fix?

Thanks for your response. I have tried that and the same thing happens. The blank email appears and I can’t remove it by clicking on the red dot in the upper left. I have to quit mail to remove it. I cannot get at my emails. I think I will have to call Apple.

In the Finder , click Applications in the sidebar, then double-click Mail..

See also Troubleshoot email problems in Mail on Mac