You can nest groups of expressions within a filter. Each expression in a filter group shares the same top-level operator (that is, AND, OR, NOT AND, NOT OR), and the results of the group are treated like an expression for the group above it.

Group level can be determined by the indentation of the group and its expressions — those expressions to the left are higher-level groups than those to the right.

The following filter indicates that files whose data is displayed in the portlet must NOT be both initialized AND either from Dell OR from Microsoft. The OR group is at the same level as the Initialized expression, and the NOT AND group contains everything in the filter.

The filter displaying a described expression

Note: Because some pre-processing of filters occurs as you select each building block of an expression or group, you might notice a several second time delay after filter construction actions.