Line shift speed

will increasing the line shift speed reduce the overscan when engraving
im engraving text about 25mm high and 20mm wide and getting overscan of about 20mm each side
running ruida controler
running at 200mm/s at 19power

No, that’s how fast it moves from one line to the next. The number you’re looking for is scanning acceleration. If you increase that it will reduce the overshoot. You can also just reduce the speed, but it sounds like your accel is probably low.

Thanks for the reply where will I find the acceleration setting in LB

In Edit -> Machine Settings. There are settings for cutting and engraving (scanning). You want the engraving one.