Hi there,
1. Go to Dashboard > Appearance > Widgets. In the Top Bar you will see the Social Icons widget. If you remove it the top bar will be removed. You can also drag it from there into the Header Widget which sits to the right side of the logo.
2. Appearance > Elements – look for the Header Element that is assigned to the Front Page and edit that. Here is the article explaining:
https://docs.generatepress.com/article/header-element-overview/