I've made recolors of Phaenoh's floor overlays, but the clickable area of them is so tiny I can never seem to click on them to delete them or recolor them.

One method is to export just the base mesh (OBJ, without shadow) and reimport (replace) it. No need to do any changes. This updates the bounding box in most cases.

If for some reason you can't do this, there is an "Add to bounding box" option in one of the GMDC tabs. This one can on occasion cause the item to break (no idea why, it seems to be a bit random), so test on a copy of the file if you're fixing a new mesh.

Thank you!