I reported a similar issue with Video Speed (and many other functions). I used to be able to select many clips and apply video speed to all of them at the same time. Not any more. This is the response from Cyberlink:
After further checking with our product team, the batch apply option of the features you mentioned is not supported in the new version of PowerDirector 365.
For your concern of the editing convenience, we've escalated the suggestion of supporting applying the editing on multiple clips at a time to product team as software feature changes improvement reference.
CL really screwed up and I doubt they'll be able to fix all their screw up. Why make the software harder and more time consuming to use?