DiffMerge can filter out entire sub-folders (and everything contained within them). This is useful for compiler output directories as well as for the various folders of state files that many Version Control Systems leave in your source tree.
The text field contains a list of sub-folder names that should be excluded. When DiffMerge sees a sub-folder with one of these names during the file system scan, it skips it (and everything contained within the sub-folder).
Items within this list can use wildcards too. And have the same delimiters and quoting details as described in the previous section.