After upgrading to Linux Mint 21.3 Cinnamon the Display manager seems to have a bug.
The display numbers in the layout diagram and the menu no longer matches, and the second display has no number in the layout diagram.
21.3 Display manager layout numbering
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Before you post read how to get help. Topics in this forum are automatically closed 6 months after creation.
Re: 21.3 Display manager layout numbering
Can you create a new user and see if the new user also notices this issue?
A woman typing on a laptop with LM20.3 Cinnamon.
Re: 21.3 Display manager layout numbering
I did find this bug report Cinnamon-Settings Display showing wrong monitor numbers #12025 so others are seeing the issue as well.
Sometimes code is zero-based (meaning the start point is zero) and sometimes it starts with 1. The guess is there may be a mismatch and something is starting with 0 instead of 1 and that is causing the issue. You may want to add your experience to the bug report. The more people who report problems with an issue, the more likely it will get attention.
A woman typing on a laptop with LM20.3 Cinnamon.