Update – PROBLEM SOLVED – I tried all your suggestions with no luck, thank you all for your help. I was about to go nuclear as Omar suggested which luckily led to me stumbling on the problem. It turned out to be User error. The original file was created using Blender 4.0. When I opened the file again on the next day the computer opened it in Blender 3.6 without me noticing it. Something about the version differences caused the tool icons to vanish. Opening the file again in Blender 4 restores everything.
