How to switch to DX 11?

Hello
I am using DX9 (I think!) on this game
I use SLI and on the Nvidia profile I have the reccomended DX9 profile selected.

How to try out DX 11?

Unselect the DX 9 profile and select a DX11 one?

Also, how do you know which one is running?

Thanks

P.S
Does anyone know what happened to the Steam workshop
It wont let me subscribe to any items. I click the subscribe button but nothing happens

 

On Steam, right click on rfactor2 > Properties > Betas

Select "v1108-dx11-open-beta" on combobox

 

Thanks very much.
I have t wo versions of steam on two different drive.
I am hoping I can run one on the DX9 mode, and the other on the DX11 Beta?
Becasue maybe switching modes constantly requires downloads

 

What means "two versions of steam"? Do you have two differebt accounts on one PC?
If not, switching "overwrites" DX9-version.

 

@peterchen I think he means multiple installs of rF2 ie one dx9 and the other dx11 on the same computer....see this thread on how => https://forum.studio-397.com/index.php?threads/rf2-multiple-installs-on-steam-tutorial.54092/