Did you install the Windows driver for the XP PEN Star 03 ? see: https://www.xp-pen.com/download/star-03.html
As well as using a dynamics brush setting have you set up the tablet in Edit -> Input Devices ?
This is my Veikk A50 tablet
Edit:
Is that the mypaint calligraphy brush ? It is worth looking at the mypaint set of brushes but the implementation in Gimp is old and no better settings for a tablet than a mouse.
If that is your interest then try the actual MyPaint program https://mypaint.app/about/ which has the updated brushes and controls. It is very much for artists but good fun whatever your skill.
As well as using a dynamics brush setting have you set up the tablet in Edit -> Input Devices ?
This is my Veikk A50 tablet
Edit:
Quote:I have maybe found what I was looking for and it could be the calligraphy tool.
Is that the mypaint calligraphy brush ? It is worth looking at the mypaint set of brushes but the implementation in Gimp is old and no better settings for a tablet than a mouse.
If that is your interest then try the actual MyPaint program https://mypaint.app/about/ which has the updated brushes and controls. It is very much for artists but good fun whatever your skill.