“Pinned to Top” will automatically move whatever element or group you use it on to the top of the page when you preview or publish the page. Even if it is floating somewhere in the page, it will go to the top. If you choose “Pinned to Bottom”, it will do the reverse and be stuck to the bottom of the page regardless of your device size or how tall you have the browser set to. “Pinned to Position” option will simply honor wherever that element or group is on the Y position. If it is floating down about 50px, it will stay 50px from the top of the page at all times when you have this option set. Depending on how you have your design setup, say you have a sticky nav bar at the very top of the design, both “Pin to Top” and “Pinned to Position” will behave basically the same.