Scene view not showing the objects added but Game view does

Could someone please explain to me why created objects are not showing in Scene in Unity Editor? What could be the missing components? But they have rendered and displayed the Game window. I just installed 2021.3.4 and there were no issues with unity 2020.3.x versions.

(Note: it's not zoomed out when I press the 'F' shortcut key to focus it focussed but not rendered.)