Qubes OS

I have installed Qubes OS but I have a problem – In some YT tutorials people can open fedora, debian, or other distributions of linux like a ,,normal” os. I mean , there was a window with separate os which they chosen. My problem is, when I open fedora for example I see only options like fedora firefox. But I don’t know how to normally open system in separate window.. I tried that qube icon I mean manager to open system but I think it does not work . Please Linux friends, help noob 🐧