Elements in the project file, what do they do?

I did some copy and replace in my Razor component project, and now I can see these in the project file. What do they actually do? By the way, the SignOut page cannot be found at runtime.

<ItemGroup><Content Remove="Pages\SignOut.razor" /></ItemGroup><ItemGroup><UpToDateCheckInput Remove="Pages\SignOut.razor" /></ItemGroup><ItemGroup><_ContentIncludedByDefault Remove="Pages\SignOut.razor" /></ItemGroup><ItemGroup><None Include="Pages\SignOut.razor" /></ItemGroup>