Scene window became all grayed out for unknown reason.
Nothing got displayed, but I can drag and select unseen objects which are still visible in Game Window.
I tried New Scene, new Project, restart, reinstalled, and it wasn’t solved.
Im not quite sure if this would help but i think i had a similar problem before…
Try going to the top right of Unity directly above your Inspector and click the drop-down called layers and make sure “Default” is checked.