Hello,
With ver 6.5.0 it impossible to add a CSS to an ID with the appearence panel using the “+” button.
Thank you for the report! We fixed this bug in the just released Bootstrap Studio 6.5.1
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working for me on Mac M1. TY
If you are on 6.5.1 and it is not working, can you reach out to us from our contact form with more info?