Disable LCD when plugged in through HDMI

[HoraceAndTheSpider]

Is this a “no you can’t and there can’t be” reply, or is it something that might be changed in the future?

I quite like the idea of pluging into hdmi and going full screen and using a larger screen mode (ie 1080) which obviously the lcd won’t allow, so that would need to be off.

are there options which might enable such a mode? I have no problem writing a Python script to do the toggle if there is a way....

Thanks