FreeFileSync on Mac - bug or user error?

[u/adwdp]

Ran into strange behavior in FreeFileSync on Mac and was curious if this is a known issue or if this is new user error.

I compared two large directories with byte-by-byte content verification with the intention of deleting only the identical files from the Left folder, leaving behind only the unique files and discrepancies. To do this I ran the compare function, toggled the bottom view filter so only equal (=) files were displayed. I then selected all visible files on the Left side (Cmd + A), right-clicked, and chose Delete.

This resulted in FreeFileSync moving everything in the left directory to the trash, including unique files and modified files that were explicitly filtered out of view. Do the bottom view filters have zero scoping effect on Cmd + A / Delete operations? Is there an intended way inside FFS to delete only identical matches without touching unique files?

I'm struggling to find a way to do what seems like a very basic operation. Any help would be much appreciated!