When a user insert a note name and the name is already taken, there is a small notification at the end of the line.
It is not visible enough, and when focusing out the name reverts to the previous option.

It took me 2-3 times to understand what the issue is because the notice wasn't clear enough.

Possible solutions :
1. add a suffix to the name
2. make a red bold notice on the name so the user can't miss it