This may not match the original posters exact symptoms but I was seeing a blank screen after clicking Create a new project (VS 2019). Discovered that the install of Visual Studio had 'finished with errors' (paraphrasing there - now I've fixed the issue I can't see the exact error message) anyhow digging into it I found that the C++ redistributable had not installed (even though I'm a C# dev that's still important to VS!)
If I tried to install this as a standalone I got an Access Denied error (even if running as Administrator). Digging into the VS install logs I found a similar report.
Anyhow after a fair amount of Googling a few responses pointed to Virus software preventing the C++ redistributable from installing (in my case McAfee). Once that was removed a repair of VS resolved the issue :)