Go to settings, Accessibility, Motor, and Cognition, and turn off the touch assistant. That should take care of your little blue circle.
Take care,
Robin
Samsung Galaxy S7 :
Settings
Accessibility
Dexterity and Interaction
Assistant Menu - turn off, no blue
Go to Settings > under Personal, choose Accessibility > Dexterity and interaction > Assistant menu, switch it off. Let me know if that's what you're looking for.