How to make objects appear again and get rid of the dot?
alright, my first problem, everything is grey/invisible in renderview (i have a camera and a light and it renders properly too when actually pressing the button)
second problem, little orange dot, it stays on the same spot on the viewport and yes, it is not an origin point since it mvoes with the viewport
you had enabled "render region", which means blender will only render a small selected area, which is probably what that yellow square you're seeing is (since the area is very small, and blender highlights it in yellow)
to disable that, you can go into view in the sidebar and uncheck "render region", or just hit CTRL+ALT+B