How To Change Link Target for the “Back to WP” Group

The Toolbar Extras Add-On for Oxygen Builder by default sets the link target to _blank for all links in the “Back to WP” Group within the Oxygen builder interface itself. This behavior can easily be changed, so that these links do not open in a new browser tab or window anymore:

In Settings > Toolbar Extras > Tab: Oxygen and there look for “Oxygen Builder Interface” and there you can set it to “No” and that means target _self.