As a title says, its all about Call screen - When you call, when you receive a call or when you are in a call.
This mod comes with a substratum theme.
Main motive of this mod is to give a Call Screen of your OnePlus 7 Pro a better view that is missing in stock.
There are two mods - MOD 1 and MOD 2.
Follow Comparison Screenshot below for a reference.
1. If you have previous version installed then remove it first completely (disable and uninstall overlay then restart)
1a. Download and Install this.
2. In substratum select mod (1 or 2) and make sure to activate it.
3. Reboot and Go to manager in Substratum, Enable this mod/overlay and that's it.
Android File Host