This is something I've seen many people struggle with and I've not been able to find a solution. Adobe support was dust remotely controlling my computer and i said nothing more could be done. The toolbar icons on Photoshop are too small on a 27" iMac. I've adjusted the fonts to large for a little relief but the icons are still small. If the icons on Lightroom can be adjusted they should also be able to be adjusted in Photoshop. Hopefully Adobe will address this situation.