How to change part's GUI dimensions

[Saint-Stanislas]

So, when you right click a part in flight, the window gets the good lenght by default, adpating to the number of lines of info/buttons it has to show. But can we adjust somewhere how wide it is ? On stock KSP it is not really problematic, but a lot of mod are showing some long lines of information that the window is just clipping and then you can't read half of it. I'm mostly reffering to KSPI, where the first info line for generators is sometimes plasma/laser consumption rate and you just can't see the numbers because they are clipped by the window ....

I'm pretty sure this has already been solved, I just can't find it anywhere on the forum through google.