If you want to take a screenshot, just change the language to English before, it’s just a click 
No. Or better to speak, only one of them can be changed individually (I think it was the speed). The other changes both, which is not a limitation of LightBurn, but of the firmware. We discussed this some time ago, there is nothing LB can do about it.
Edit: found the post: Question regarding power and speed adjustment on the fly - #3 by ehendrix