@Pratyush Sharma
I am using macOS Catalina 10.15.7
I have 2 external displays hooked up to a macbook. Every time I start Enpass it always opens on the macbook display. It will not open on the display I activated it in.
Every other OSX Application I launch registers itself correctly. Ie, when I launch my browser (Brave) for instance I can go to the Application menu and under Window it will show options to move the application to an available display.
Contrast this with Enpass only showing Main Window.