Set your widget to have a fixed position and place it in a custom position. The element will stay fixed in that position as the page is scrolled.
Under any Widget > Advanced > Custom Positioning
Position: FixedDrag and drop the widget anywhere on the page using the aqua arrows drag icon
Tip: Confused between Sticky and Fixed? Sticky is a scrolling effect which is relative to the section it』s placed in. Fixed position, however, is relative to the user viewport.