in My Visual Studio Add Reference Button is Missing But in Visual Studio of my teammate everything is ok and I Don't Know what can I do to resolve this problem?

Photo of my VS is:

You will then get the reference manager screen. If you then navigate to the "Browse" section, this should be the same as what your teammate gets in VS:

I tested this out on a new project in VS2022 17.0.5 as a .NET Standard 2.0 Library and it all works as expected.