Nobody is forcing you to watch Donald Sutherland films… oh wait, nevermind, misunderstood the post.
my best guess would be to check the accessibility settings carefully? this seems like a shortcut enabled from there, what does it do?
I’m really not sure though if you haven’t messed with them prior. sorry I don’t know more
As far as I can tell, it does nothing. I can push on it, I can try to pull from the left side or from the bottom or from the corner, but I can’t get it to do anything. When I open a new app, it appears there in the corner.
Have you tried turning off and then on again?
Fixes way more things than it should.
It seems to have fixed it. Now the microphone is not even there with the keyboard

Looking around online it looks like it might be a bug with keyboard dictation. I didn’t find a way to fix it other than rebooting or maybe trying to toggle the setting on the keyboard.
Here’s a link to a thread that’s basically useless but the screen shot looks like it has the same mic icon https://r2.community.samsung.com/t5/Galaxy-S/Mic-button-displays-on-the-bottom-left/td-p/17377304



