Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
I can't find find a way to remove masking data in the Movie Clip Editor. How to get rid of it?
Hold down Shift and click on the X button right beside the mask dropdown.
This will unlink the 'mask data-block' from your file. To get rid of the mask's data, you can either save and re-open your blend-file or just click the Purge All button in the Outliner:
Required, but never shown