DX11 beta - Stretch UI issue

I own an old (but very good) 4:3 display, so I need to disable the stretch UI switch, but in dx11 I got this:

 

It's the same as on my ultrawide monitor, but with artefacts from former race session an left and right side.


But it's not DX11 related. It was already the case in older builds.
For me it's not a big deal. I can live with it.
And sometimes it was even good to see some telemetry data (from Trackmap plugin), which left some useful info on the sides of the screen.

 

No, your is not my case.
Before dx11 I had two black bands, one over and one under the UI

 

I still have this problem.
Is there any hope that will be resolved sooner or later?

 

Is gona be solved whit the new UI i hope

 

Now is fine!