don't know if I have to put this in "customization" or in "questions" because it's directly related to the layout

Is there an option to force the FPane widget to hide the tabs to have this (see attachment) when opening GMB

Type= P
Name=Same artist2
VPmain = FilterPane1(nb=2,hidebb=1,pages=album,page_album/mode=mosaic,hidetabs=1,group=Play:first_artist) _SongTree(group=Play:first_artist)

This will default to mosaic mode without tabs, but the user may change it.