From Header Design & Colors tab you can change colors, font size and hover design.
These are settings from this area:

Header and Sticky Header Height

These options apply for header type 1 and 2.

Top Menu and Menu Item Font Size

Border Bottom Header, Sticky Header Height and color

Top Bar Background Color and Font Color (Header Widget Menu)

Help for header widgets setup: http://help.wpresidence.net/article/widgets-2/#a_wpestate_id

Top Menu & Sticky Menu Background Color

Top menu, sticky menu, hover menu and active menu font color

Top Menu Hover Options

From the same settings you control hover design style (you have 6 different styles to select from)

For Hover Type 1, 2, 5, 6 – setup color for Top Menu Hover Font Color option
For Hover Type 3, 4 – setup  color for Top Menu Hover Background Color option

Transparent Header Color and Hover Color

Menu Item Color

Menu Item Back Color

Menu Item Hover Back Color

Menu Item hover font color

Menu border color