Steps to reproduce the issue :

1- add the main menu module to menu position .
2- add the search module to search position

the main menu and the search is inside the blue header and under the logo .
the blue header become big and ugly .

to solve this problem :
Fix 1 :
move the search & main menu to be Next to the logo and make the logo more small . and make the search Height more small .
fix 2 :
extract main menu & search position from the header to be under the header div .
then add option to fixed the main menu & the search (the user can fixed header position only or fixed header and main menu + serach with 2 options to choose)!

Actual result :

FIX 1

FIX 2