Graphics API
To run your projects through a different API than the default one, add the following line to the PropertyGroup of your executable's .csproj file:
<StrideGraphicsApi>Vulkan</StrideGraphicsApi>

Supported values are as follows:
Null
Direct3D11
Direct3D12
OpenGL
OpenGLES
Vulkan
You may also have to add <PackageReference Include="Stride.Shaders.Compiler" Version="x.x.x.x" /> to your main .csproj, and don't forget to replace Version appropriately.
Engine
If you are using a local build of the engine you should run the build again with the following command:
msbuild /t:Build /p:StrideGraphicsApiDependentBuildAll=true Stride.sln