If they all need the same Effect, just apply it to the first Clip/Still Image, and adjust, as required. Then, Rt-click on that Clip/Still, choosing Copy. Now, Select all others, Rt-click on them, choosing Paste Attributes. Done.
PS - if needed, though you did Paste the Attributes, you could still manually tweak each one, as needed.
Thank you for that correction. Maybe one day I will get all of the syntax changes straight in my mind - and then they will be changed again.
After about 8 years, PrPro made some changes in verbage too, to make FCP, and AVID switchers feel more comfortable. Just more to learn.