2.83: How to enable depression In the above image there are depressions (ex: pointed by the red arrows). On the other hand, in the below image same points are flat.

So how can I enable the depressions? I want to do that cause it helps me seeing easily objects. Thanks.
You could enable the Wireframe option in the Viewport Overlays panel:

Or enable the Shadow option in the Viewport Shading panel: