I have a thin blue line on the right of the display on my huawei p 30 lite, does anyone know what that is?

The line is very thin and mostly only visible in shades of blue and black. Has anyone already had experience with it and knows what it could be?

Sounds like a defect, display or graphic error. If drivers or the like are now working properly, you can't do anything about it, except

to buy a new device
to fix it
to live with the mistake.