How to set 1.33 anamorphic clips in bulk?

I have the Moondog anamorphic adapter to shoot videos with my phone when I'm not using my Blackmagic camera. That adapter has a 1.33 aspect ratio, but how do I tell the app that my clips are 1.33? In the Media tab, when I click "clip attributes", there is a "1.3x anamorphic" option, but this seems to default to 1.30 and not to 1.33. What this does is create black bars left and right of my video! The only way to fix this is go clip by clip and change their value in Inspector, but I'd like to be able to do this in bulk: EITHER by selecting many clips in Media and set their attributes to 1.33 (and not 1.30), OR to setup the timeline itself to 1.33 (and there doesn't seem to be such an option in the project properties). How should I go about it so I get my video properly desqueezeed? Thx!

eugenia, please try this:
In Preferences, go to Project Settings
Master Settings <Pixel Aspect Ratio>
Select, Cinemascope.

Also, you can select >Output Blanking > in the Timeline of the Color page >Menu< and choose 1.33
Hope this helps

Unfortunately, none of the two options do what I need. I simply need to desqueeze the clips and these options don't do it. In fact, I might have a mixed timeline sometimes, so it's better to do it per clip. Resolve already has the option I want, which is to select multiple clips in the media master, and then click Clip Attributes, but the problem is that they don't have a 1.33 option! Their option seems to be 1.30, it does not show as 1.33 in the playback window (hence the black bars I get)! This seems to be a bug I think, because most adapters are 1.33, not 1.30 anyway.

Unfortunately, none of the two options do what I need. I simply need to desqueeze the clips and these options don't do it. In fact, I might have a mixed timeline sometimes, so it's better to do it per clip. Resolve already has the option I want, which is to select multiple clips in the media master, and then click Clip Attributes, but the problem is that they don't have a 1.33 option! Their option seems to be 1.30, it does not show as 1.33 in the playback window (hence the black bars I get)! This seems to be a bug I think, because most adapters are 1.33, not 1.30 anyway.

Yes, that aspect ratio sounds rare. One more check:
In Project Settings >Image Scaling< do you have, Scale Entire Image to Fit, selected?

DVCPro HD seems to have the right aspect ratio at 1.333. I use that now, it works now!