https://test-steamproxy.haloskins.io/steamhelp/en/faqs/view/7D01-D2DD-D75E-2955

FOR LAPTOP WITH NO VULKAN AND NO DX11 OR ABOVE SUPPORTED.

The best way to set these environment overrides for all games is by renaming user_settings.sample.py to user_settings.py and modifying it appropriately. This file is located in the Proton installation directory in your Steam library (often ~/.steam/steam/steamapps/common/Proton #.#).

Open user_settings.py and remove # from "PROTON_USE_WINED3D": "1", and "PROTON_NO_D3D11": "1", lines.

If you want to change the runtime configuration for a specific game, you can use the Set Launch Options setting in the game's Properties dialog in the Steam client. Set the variable, followed by %command%. For example, input PROTON_USE_WINED3D=1 %command% to use the OpenGL-based WineD3D renderer instead of the Vulkan-based DXVK renderer.