Dual monitor: Set the external monitor as main display but external monitor not working [migrated]

I was using an external monitor on extended display in Windows 10, along with my default laptop screen.

Somehow I marked the external monitor as the "Main Display", now due to resolution issue, I only see a black screen and "Monitor out of range" written on it, when I extend the display.

My laptop's screen is not able to open the "Display Settings" as it is not the main monitor.

I tried connecting another external display and making the laptop screen as the main monitor, but as it turns out, Windows remembers monitors.

How do I make the laptop screen as the "Main Screen", any help would be greatly appreciated.