Myriad problems with Kmail

Help
1

I’m just recently back on Linux, but in the old days I used Kmail. I don’t remember having nearly this many problems with it. Here’s a list:

  1. It’s not pulling all of my emails (it’s a Gmail account) from the server. Only those up to 2021.

  2. Although I chose POP in the setup, but it’s not removing my emails from the server. In fact, when I delete the ones it downloads from the server, it then proceeds to download them again.

  3. I can’t launch kmail from the tray icon; I have to go through the application menu.

Did I royally screw something up on install, or is this thing just plain broken?