Hi there,
Thanks for writing in!
– This is called “Header Widget Areas”.
– You can place widget on the header area. If you click on the + icon then it will dropdown the widgets. See from demo – http://theme.co/x/demo/integrity/1/
– You can manage this from Customize > Header > Widgetbar > Header Widget Areas. To remove this, select None (Disabled)
– I believe you got this answer already. It expands to show the widgets on it.
Hope this makes sense.
Cheers!