Bounding Box Burden - Photoshop

Out of the blue, every time I open a pdf or select all, etc., a bounding box has started to appear on all of my documents. I know I can command H to hide them, but I never had to until today and obviously don't want to have to start. I tried quitting with that "unclicked" to no avail.

Any idea how to get rid of it permanently?

Thanks

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