How to turn AltGr into Right-Alt system-wide

I use Cinnamon wih an American keyboard. How can I get the AltGr key to act like an ordinary right-Alt?

Some say that I need to disable the Alt third level somehow. But how do I do that? I find no such options in the system settings menu.

I don’t use cinnamon, but in your keyboard settings there should be a section for layouts (eg English (US)) and a button or section for options. What you want is probably in those options, third level shift is.

Though AFAIK the English (US) layout doesn’t have 3rd or 4th levels, so doesn’t define 3rd level shift.

Please provide the output from this command:

setxkbmap -print -verbose 10
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