Sticky header: It is a feature to make the header visible when the scroll scrolls down.
01) Access the Control Panel
02) After login click on Layout
03) Edit the Active Layout in Options >> Edit
04) In the Topo (Header) box, edit the lines:
Fix Header: true = Enable or false = Disable
Fix Header Height: Set a height (numbers only)
Background Color Fix Header: Set a color
Note: You can manage it through the Control Panel >> Configuration >> Boxes or Color