Good to hear. It's not necessary to change the A/R of each clip individually.
On the sequence, select (highlight) those to be changed, click the FX button on any one of them, open Effects and click the desired Aspect Ratio button.
Then, click the sixth button from the right on the toolbar (REPLACE effect chain in other selected clips). That will apply the change to all selected.
Do this prior to other effects if possible. The Next button to the right will APPEND to selected clips.