Hello, There How to remove the Default page Top Padding of 40px; and how to apply the whole page background Color. Please check Here screenshot https://prnt.sc/U1dPXFLAdOvj.
But now I face another issue. If I change the background color from the theme settings option then it also affects on backend side as well. I just want to affect on frontend side. https://prnt.sc/fwV_inTEfwgz
You should deactivate all plugins (except Required Plugins) and then reactivate them one by one. This makes it very easy to isolate the plugin causing problems.