My new S25 Ultra won't go full screen

[usersU7AWXItQX]

This is the same problem I had with my S23 Ultra, when I watch YouTube, or other media like Rumble, ect... directly wired with hdmi to a monitor, the picture is using only about 75% of the screen on the monitor, and the screen on the phone is short on both ends. There's no full screen settings anywhere in this s25u, and it's getting very frustrating now, because there doesn't seem to be anyone at Samsung who has answers. 

The monitor is a newer Samsung curved gaming monitor, and when I put the phone in Dex mode, the screen is in perfect full screen, and when scrolling on YouTube, it also is full screen. When I try to watch a video, it goes into the above described smaller picture, with large borders around top, bottom and both sides. I would appreciate any help I can get on this, because this nice phone should be able to do this without me having to be an IT guy to make it happen.

[meself]

Think it's with many models same result

[usersU7AWXItQX]

Thanks yeah well if this isn't fixable, this will be my last Galaxy phone. My Note 9 did full screen perfectly, just plug it in and straight to full screen.

[meself]

I know few models not note model that have same result

[usersU7AWXItQX]

I can't believe how lame this is. I use my phone as my primary medium for entertainment. Maybe I'm the only one, because nobody else is complaining about this.

[meself]

It's like on news if a phone camera used it's like a third of the screen maybe online or social media also it shows that way anyway I think it's the format of the phone versus a TV

[usersU7AWXItQX]

Samsung needs to fix this.

[usersU7AWXItQX]

Then why does it work perfectly in Dex mode? That's not why.

[meself]

Dexter mode would be a smaller screen i.e monitor not a TV which is larger

[usersU7AWXItQX]

Just the fact that Dex goes full screen in desktop mode, means that it's not a problem with my setup, it's 100% the phone software.