One of the annoying things about a fresh install of visual studio is that when you open a UWP solution it only shows you the project in the Solution Explorer and not the solution that it exists in.
This is fine for most projects but sometimes you need to add another project to your solution (such as a background task). To be able to do this you need to show the full solution in the Solution Explorer.
To fix this is thankfully an easy task.?Click on Tools->Options->Project and Solution->General, and tick the “Always show solution” checkbox.