Select Render Walk → Editor UI from the side menu.

Here you can see all the elements currently visible in your tour and modify them.

In the lower right corner you can see Facebook and Whatsapp messenger icons.

Editor UI - Facebook and Whatsapp messenger icons in lower right corner

Click on this item to edit: you can enable/disable its visibility and change its appearance.

Facebook Messenger settings panel - enable visibility and appearance
Whatsapp settings panel - enable visibility and appearance

After changing the settings click Save in the top-right corner to apply them to your tour.