Deleted scanners still in dropdown list - how to get rid of them?

Acrobat Pro DC 19.021.20056, Win 10 Pro 64 bit.

I have had to uninstall/reinstall the drivers for one of my scanners (Brother MFC-J995DW) a couple of times after the drivers failed and I couldn't connect to the scanner via Wi-Fi. However, the deleted scanners are still listed in Acrobat when I use File / Create / PDF from Scanner. They aren't listed in Control Panel (Device Manager or Scanners and Cameras). How can I get rid of them from the dropdown in Acrobat?

Thanks!