Hello Minh Nguyen,
Thanks for contacting us.
We have added hide/show setting for social icons in the top header section. So, Please download our latest version of theme, re-install it.
Therefore, Now you can go to Appearance -> Customize -> Theme Options -> Header: Top Bar -> Here you will see Hide/Show Setting for all social icons. Please check these setting according to your need to display your social icons in your site. Save these setting to apply changes.