The quick guide buttons allow you to quickly do common GuideGuide tasks that don’t require configuration. You can add guides at the sides and midpoints of the current context. You can clear guides. You can also toggle guide visibility. Just click the button and the thing will happen.
Clear guides and toggle visibility are not available in Adobe XD, which not have a native guide feature that is available to plugins. Instead, GuideGuide simulates guides by drawing lines in your document. Plugins may ony manipulate selected objects, so it is in possible to globally manipulate all guides created by GuideGuide at this time.