Adding a separate display to my New MBP

Interesting issue.

I have a Aorus FO48U gaming monitor. I find that when i first connect the MBP to power and then plug in a separate external display (USB-C to DisplayPort) , there is no signal to the monitor at first. I must open the MBP, log into the mac, then the display picks up. Then I can close the laptop and use the display with the MBP lid closed.

Not sure why this is happening. My other MacBooks all worked normally by plugging in an external display and keeping it closed provided power was t the MBP.

Any ideas?

Thanks!!

AJB