Solved Why is there scanner settings twice here?

Can you tell me how I could remove the printer and all drivers in case I need to?

To remove the printer: Settings > Bluetooth & devices > Printers and Scanners > Remove (after selecting the printer). See the button at the top right of your screenshot.

A first step to getting rid of the detritus from a Brother install (don't get me wrong; I love my Brother printers, it's the software garbage I hate) is to open Settings > Apps > Installed apps, and uninstall all Brother software listed. I have done that on several occasions, and my Brother printers have worked beautifully without the junk. I'm not sure this will do what you want, but it's a first step to the elimination of Brother-software-caused problems.