Now some solutions. I’m at work so I don’t remember off the top of my head if it’s in edit mode or object mode. If it’s object mode then it will be in the menu object->clean. If it’s edit mode you will need to select all and click menu mesh->clean. It will have zero. I don’t remember if it has both face and edge or just face or just edge. You are looking for the cleaning option if zero. It will give you a distance option. Sorry I don’t remember if it pops up or is in the last operator box in bottom left hand corner. Next in edit mode select all and press m->by distance. If you’re still having the problem then F4->preferences->addons->search for print and check 3D print tools. The options will appear in the n-panel(technically the side bar). You check all if you still have zero faces/edges then you’ll have to manually edit topology or adjust modifiers especially solidify and bevel. If no zero faces/edges then you probably need to update your GPU drivers.
