How to stop pop up on screen when trying to read it
How do I stop the pop up on right side of screen when I try to read something
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Are you triggering a preview window or a slide-over view?
When opening a link, a long-touch will usually open a small preview window - along with an Action Menu - whereas a “tap” will open the link.
You may find these overview Apple video guides to be helpful:
After viewing, you’ll be ready for the additional Multitasking Guide:
Use Multitasking on your iPad - Apple Support
The iPad User Guide for iPadOS is also a rich source of information. Here are links to both the downloadable and online versions of the Guide:
iPad User Guide on Apple Books
iPad User Guide - Apple Support
I hope this explanation and additional information is helpful in resolving any difficulties you may be having with Multitasking features of your iPad.