Is there a way to make pop-ups in ArcGIS Online floating or draggable?
In case of long text in pop-up, moving with a whole map is for map users impractical.
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Sign up to join this communityCurrently this is not possible in the map viewer. The 4.0 JS API has added the capability to dock your popups. Here is a link to a sample showing the popup docking. Just click the square box and it will dock it to the right corner.
Just to piggyback on the above answer, here is a forum post on how to do it in JS 4.x. It includes example code.