Using VS Team Explorer, I cloned this project https://github.com/nicomp42/CybersecurityGroupProject.
It loads into the Solution Explorer like this:
I have to double-click on the .sln file to make VS think it's a VS Solution. After that I able to work with the Solution and the Project in the Solution.
The original GitHub repo was created from a VS Solution and published it to GitHub using Team Explorer. Did I do something wrong or is it supposed to work this way?
It's just a 'Folder View'. You can switch back to solution by 4-rd button on toolbar. If it is initially opened as Folder View, then you opened your project as folder (it happens after clone repo automatically) and just need to open *.sln file instead.