If you're talking about the action of scrolling:
* Stop: This is a general antonym for any movement, including scrolling.
* Pause: Similar to stop, but implies a temporary cessation.
* Hold: This implies a deliberate decision to keep the content in place.
* Zoom in/out: This is specific to digital scrolling and refers to changing the scale of the content.
If you're talking about a scroll as an object:
* Book: This is a more modern form of writing.
* Document: This is a general term for written material.
* Tablet: This refers to a flat surface, opposite to the rolled-up form of a scroll.
If you're using "scroll" metaphorically, like "scrolling through memories":
* Focus: This implies a concentrated attention on a single point.
* Remember: This implies a conscious act of bringing something to mind.
The best antonym will depend on the specific context of your usage.