You can customize the Mobile Menu as you like. Follow Theme Options > General Settings. Here from the Header tab click Mobile Menu, and the menu style field will appear.
Custom Mobile Menu Style: Switch on for the custom mobile menu style.
Mobile Menu Icon Color: set the mobile menu icon color.
Sticky Header Mobile Menu Icon Color: set the sticky mobile menu icon color.
In other Fields, you can Set Mobile Menu and Mobile Submenu Color, Hover Color, and Active Color.
Click Save Changes to save theme options. Click Reset Section to reset only this section. Click Reset All to reset all theme options.
