After a lot of reading I found the solution.
Luckely I’m using Fedora. If I login with a XFCE-session I can’t see the internal storage.
If I login with a Gnome-session then my computer sees the internal storage.
Perhaps you can run a Gnome-session as well on your Linux-adapt and perhaps you’re lucky to.
At the USB computer connection;
Choose ‘MTP’ if you want to connect the internal storage
Choose ‘USB storage’ if you want to connect an external sd-card in your phone.