As I am working in the GFUI I am getting nearly blind looking at dark gray lines against a dark background. I suppose if I were working on pink acrylic it would be easier but most materials (and all woods) make it very hard to see.
Sometimes the current cut is red or if you are over the referenced cut it is red or blue that is a bit easier to see but you have to go over the relevant button to get it to change. The buttons themselves do not highlight so that is the first suggestion that when you highlight a cut the button lights up a little if you have only part of the cut (or a different color) and lights up more if you have all that button wants to cut.
A different problem comes when you are trying to see the surface and the design (of any color) is in the way. The ability to hide or show the cut would be easy for each cut and parts the will be ignored for that whole round can be out of the picture (I do want them there when moving stuff around!) But that needs to be a choice.
The third very annoying thing is trying to move the whole design and getting only a part or trying to move a part inside a larger part and having to move the large part out of the way or you cannot get it at all. Often there will be engraves that go with cuts and alignment there is critical but trying to move several parts about to use scrap (or make less of it) there is a need to link some parts and not others. Call this a bonus ask as I know this is not so easy.