Show hide this part of sidebar

[VinterSolen]

I know i have seen and toggle a setting, somewhere, that toggles between showing and hiding this section.
But now i have sat for nearly an hour toggling most options that even remotely sounds like it could be that bar/row, but none has hidden it.

Im quite sure its a sideberry setting, much less sure its not a setting for floorp, have not seen a setting for this section "anywhere".

I am using sideberry on Floorp 12 RC.

[mbnuqw]

No, it's the browser part, can be removed with userChrome.css:

#sidebar-header {
  display: none;
}

For the new sidebar (sidebar.revamp: true):

#sidebar-panel-header {
  display: none;
}

[VinterSolen]

I found the setting, its part of Floorp Hub, Under "Tabs & Appearance"

Enabling this setting, removes that white section.