It activates the mouse pointer "Precision Select", this is a good thing, just noting it.
Left click and hold of the background map to move it around often, not always, looses the grab
It seems like it hold permanently if the hover menu is allowed to display the data
if the data is fetching, then the hold doesn't work, a short jitter move of the map occurs, and then mouse movement continues, with the precision select mouse pointer active again