Using blender 2.83. I might misunderstand the terminology but I think the dotted square inside my viewport is the render region? As you can see, even with the checkboxes unchecked it won't disappear.
I've searched everywhere (even found this thread How do I clear the render border?) and all I can find is CTRL + ALT + B, CTRL + B, ALT + B etc etc, to turn it off. I've even disabled it in the preferences, but I cant get rid of this region.
Any ideas what I might have missed?