Quote Originally Posted by JimmyV View Post
How does one insert the search bar into the header? With it a sidebox it disappears under a certain size and really it needs to not be a sidebox?

Also how does one make the mobile menu expanded always?
The search-in-header requires that the sideboxes/search_header.php be enabled in single-column mode.

For the 'always display', try Googling Bootstrap 4 mobile menu always display ... that's the beauty of a template that's built on a standard!