I attempted to save out four approximately equal subset regions from a large (~80,000 image) project as separate chunks to process more efficiently. The original project was 467 GB Most of the size of the project was saved key points (437.14 GB), and after trimming it to sub-regions, and running the Tools/Preferences/Advanced/Clean up project... task (no junk files found), The smaller chunks were still around 440GB - and had exactly the same size key point file (437.14 GB).
To trim the project extent, I selected the region(s) to delete, then right-click/Remove Cameras, reset the region, and saved out the new chunk.
Is there a way to delete the key points that are no longer referenced by any photo in the project?
Andy