A pop up that says ‘Switch control, External switch not found’ will not go away on my iPad

so basically there’s this little black thing at the top of my ipad and it says “Switch control

External switch not found” and i don’t know how to get rid of it i connected my keyboard and mouse to try and i even added some switches to accessibility but i don’t know what to do and it’s scaring me. please help me

[Re-Titled by Moderator]