right, let me add some details.
Music is stored on a NAS which is mounted to the file system of the squeezebox server. So you can select music by browsing the library from the squeezeboxes. Every room has its own raspberry (zero) with speakers connected to it. Additionally, I have installed the touchscreen to control the players with Jivelite. So basically, you can select every player in the house within Jivelite (or the mobile app on the phone) and control the playback. The device that is running jivelite has no player and no speakers installed, it is just used to control.
And for exactly that device, I would like to create a shortcut in the main menu. The kids could also browse through the menus, but that’s more difficult and confusing for them.