You can remove the Feedback widget from your page layout.
This comes from the FeedbackWidget in Atlas. If you look at your page, you are probably using Layout like Atlas_Default or Atlas_TopBar. You would need to remove the widget from the layout.
Ideally, you shouldn’t edit the layout directly in Atlas. Instead you should create a new layout based on the layout in Atlas. Edit this, and use this new layout in your pages. This means if Atlas changes in the future, you still have a safe upgrade path, and won’t lose your changes.
Hope this helps.
This is the Feedback Widget. Go to your Page Layout (Picture) and remove the snippet with the widget in it. It should be gone then.
Hope this helped!