All the options related to the themes are available inside Appearance > Customize. So, check each and every options there in detail. You will get tons of useful settings there.

• Go to Appearance > Customize > Header
• Checked (Enable Top Header)to show the top header section like search and social icons.
• Manage the top header part.
• Click on the Publish button to save the changes.

Note: Go to Appearance < Menu to manage the menu for the top section. All the menus are managed from here.