Why are all the classes in the namespace no longer visible to me?

Question

phpstorm

The program does not see any namespace, everything was fine before. I tried to uninstall and install the program but it didn't work. What could be the problem?

In reality, they are files in this directory and are called so

Answer 1

settings->directories
configure the Source directory(s) with base namespaces.
In my opinion, if I'm not mistaken, the PSR-4 Namespace detector plugin also helped (but I'm not sure)