Can we get HDR enabled in dashboard, so the screen wouldn't blank out each time we switch a...

I can't explain the time difference or how it goes about doing it but its most likely just how the specific monitor handles hdr as the blank screen is what happens when hdr gets turned off as it isn't enabled in the dashboard only for games and media.

Also as of now that's just the way it is as there's no option to enable it for the dashboard

On your console display settings, is HDR and Dolby Vision enabled?

Most people that get flickers on the screen (both playing or only on the dashboard) with Dolby Vision on is because both HDR and Dolby Vision are enabled at the same time.

Just try to turn HDR off and see if it solves your problem. If it does, unfortunately we will not be able to do much about it. It's a bug reported by some people and the only option would be use HDR or Dolby Vision, not both at the same time

We will definitely need some more information to properly troubleshoot your issue. Are you getting an error code or not? Does it load up the dashboard and then go blank, or is there always just a blank screen? Has it ever displayed properly or is this
a new and changed situation?

We can help troulbeshoot, but we need details around what's going on, and please be specific, and we'll be happy to try and pinpoint what it is, but with the information given, all we can do is provide general troubleshooting pages such as this one about

troubleshooting a blank TV screen with the Xbox One.

Firebird, yes it's clear there is an attempt at a mode switch because the screen goes dark and re-initializes but like I said the Netflix app then displays very muted colors like its expecting to output HDR but half the color data is missing. If I back out
to the dashboard, the off-color stays. But if I then quit Netflix, the screen display re-initialized and colors are back to normal.

Clearly the Netflix app believes it is in HDR mode because HDR-enabled titles are clearly labeled as such when I have my One S in HDR mode. If I disable HDR, then the Netflix app no longer displays the HDR label on compatible titles. Only 4K UltraHD. So
the app is trying but something is off.

I know others are having a similar issue...there is a Reddit thread about Netflix displaying muted colors on Xbox One S in HDR mode. So it's not just us.

Would be nice to get an official word on this and hear that a fix is coming. I can tell you that Mad Max looks incredible with HDR enabled. I wasn't sure how much of a difference it would make, the the clarity and contrast on the colors is night-and-day
vs HDR turned off. Would be very nice to have Netflix working properly as well.

Hi,

What happens if you turn off both allow 4K and the HDR setting? (turning off Allow 4K should turn of HDR anyway).

When your playing games in HDR and go back to the dashboard there will be a momentary pause or black screen. This is normal as the Xbox dashboard operates in SDR and both the monitor and the Xbox should switch back to SDR.

I'm just curios to see if there is an issue with switching between HDR and SDR on this monitor.

Also, if I'm not mistaken, the M27Q is an older HDMI 2.0 display and that can be bandwidth limited. Besides, this is only an HDR 400 display which means it doesn't get bright enough for HDR to really stand out. Decent HDR needs HDR 600 or more to actually make much of a difference together with good local dimming.

Just because it can do HDR doesn't mean you need to have it on. On displays with poor HDR implementation having it on can actually make the picture worse.

Have you updated the monitors firmware?