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OP asks for how to switch FROM. You post a link that asks how to switch TO.
I no option selected: You can change in settings.
If started with a launch option, like -dx12, -dx11 or -vulcan: the settings will be "forced" to that.
Or at least that is how it SHOULD work.
I HAVE to put the dx12 command, otherwise it will force dx11 instead, and dx11 runs a lot worse.
Not having a command automatically forces it to dx11 and my gfx option ingame is greyed out. For now I have to force dx12 until I got a solution.
You will have to create your own line of code in the configuration, but the normal Launch Command(s) SHOULD suffice:
-force-d3d12
-d3d12
-dx12
In you local appdata in the engine.ini, modify the line as below :
[/script/windowstargetplatform.windowstargetsettings]
DefaultGraphicsRHI=DefaultGraphicsRHI_D3d12
I've noticed that if you change to Vulkan, the other options become grayed out as pointed out. HOWEVER....... I also noticed something since I use RivaTuner for a custom overlay.
To fix this issue, you just need to tell steam to use the either or launch command -dx11 or -dx12.....
However, when starting the game back up the Api box still shows dx11 and is still grayed out....
This is not the case, a overlay such a rivatuner will show that your game is running DX12, even tho the options shows dx11 selected......
Now, quit the game, remove the steam launch option and restart. The game should be using the API you just forced and the selection box works again.