title: Visual Studio Show All Files not working - not showing some folders and files
body: <p>I've started a new project and I've copied and pasted in some test files from another project. Normally to include them in the project I'd toggle on the &quot;Show all files&quot; option in the solution explorer. However that isn't working and I can't work out why!</p>
  <p>I've updated to the latest version of VS Professional 2019. I've restarted the application and my machine. I've deleted the sln file and rebuilt. I can exclude files - I just can't get them all to show! Below I've attached a screenshot of an empty project with two test files that should be showing but aren't.</p>
  <p>Anyone know what I'm doing wrong? :(</p>
  <p><a href="https://i.stack.imgur.com/wfP5I.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wfP5I.png" alt="enter image description here" /></a></p>