Dex rotation for samrt phones: how to switch portrait display ?

[VsCoDe]

Dex is a very productive mode.  Why there is still no portrait mode for dex?

It's very convenient to use these flagship smart phone with a portable screen.

BUT

Dex can not show portrait A4 pdf file. Because it can't display in portrait direction😔.

Dex can not use full screen to play vertical game.  Because it can't display in portrait direction😔.

If we turn off dex but use mirroring output, there are still large black block and only a small part in center display portrait app. 

Why can't let dex have a landscape/portrait switch button?

Portrait mode can significantly enhance productivity and usage of dex mode.

Please, is there any method to rotate apps in dex ?

And please Samsung develop team to enhance dex supports both landscape and portrait in future release

[2TC-sy67]

Go to Settings_Display_Screen Size, then choose the appropriate size. The screen size should be compatible with the app you are using or with the frame size and display resolution. To be able to rotate the app horizontally and vertically.

[VsCoDe]

Could you tell me where this setting is?

Currently I am using S23 ultra with a portable 14 inch screen  

[2TC-sy67]

I wrote to you clearly!

[2TC-sy67]

The phone screen resolution must match the computer screen resolution.

[2TC-sy67]

If you want to know the phone's resolution, you can download a program from Google Play to know the screen resolution, or take a screenshot and then go to the image and view the details. You will see the resolution of your phone's display screen.

[VsCoDe]

Display -> Screen Size options are for phone screen not output dex screen🤔

For dex setting it only have 1920*1080 and 1600*900

No other options🤔

And spec of my portable screen is 1920*1080 also

[2TC-sy67]

I don't see any compatibility issue, what do you mean by portable screen? If you mean computer screen or tablet, you should check the Dex app settings.

[VsCoDe]

Dex is run on portable screen.

My request is that to rotate apps in dex.

But I can't find any setting about this in dex😢

[2TC-sy67]

Samsung website writes a note about Dex program,Obs! De funktioner som stöds kan variera mellan olika enheter.