How can I enable shading in texture mode? I've been looking for a solution for about 45min and I can't find it anywhere (on the internet too). In texture mode, the object has no shading and I can't recognize any shape, which makes it impossible to texture paint.

Solid mode:


The same frame in texutre paint mode:


Here's after following the tutorial. At the point, he had shading "on". I did the steps in the video with smart UV project, adding a material that way and so forth:
I've asked this question on a discord server where I got a one-line answer that solved the problem within 20 minutes.

Solution: Disable any overlays in the 3D viewport. When you take a closer look at some of the problem pictures, you'll find the overlays enabled. Here's what it looks like when they are turned off: