GP Tweaks is a plugin provided by DR7Media to enhance the free theme, GeneratePress.
Here is a screenshot of the menu and header modified by using GP Tweaks:
Here is a video overview:
Additional options include modifying the footer and the Back To Top button.
The default copyright text that comes default with the GeneratePress theme is removed. Preferred text including HTML can be added. Additionally, the background color, the text color and the link color of the text can be modified.
The Back To Top button color, and hover color can be modified according to your preference.
Get the plugin from the wordpress repository at: https://wordpress.org/plugins/gp-tweaks/.