Can't see C++ classes in content browser

I opened a 4.26 C++ project in UE5, but can’t see my C++ classes
I tryied to regenerate VS files and recompile, still nothing
I tryied to add new C++ classes from the editor (Tools → Add new C++ class), the .h and .cpp files are created but still no “C++ classes” folder in the content browser. I tryied regenerated VS file and recompile : nothing.
Obviously, the “show C++ classes” setting is checked and the folder is visible in content browser while creating a blank C++ project but not in an already created project.

Any help please?