There is a ComboBox control at the bottom of the trees; it says 'All Files'. If you select the down arrow button at the end of the box, you will see a list of predefined filters, such as: 'Images' or 'Text Files'. Choosing one of these temporarily hides all files within the tree that do not match the chosen filter. To restore the tree to its original state, restore the filter to 'All Files'. Note that filtering does not change what files are in your collection, nor does it affect the folders within the tree.

The workspace tree filter stands alone. However, the collection trees here and on the Enrich view share the same filter.

The filter control ComboBox is editable. You can specify a custom filter by typing in a pattern against which files will be matched. This pattern may be a regular expression, or use standard file system abbreviations such as *.* or *.doc.