Please go to WP-admin > Theme Options > Headers > Edit your header > Header > Scroll down to the Sticky header section
Enable the sticky header and choose a header mode for the sticky. There are 3 types of the sticky menu mode: Left, Center, and Right.
Enable sticky header
You can find an option to change the sticky max-width and adjust the padding and border of the sticky header.
After enabling the sticky header, scroll down and upload a sticky logo. You can also be able to configure the type of sticky header on desktops, tablets, and mobile devices.
Upload a logo for the sticky menu
Moving to the menu section in settings, you're able to control the design for sticky menu.