The filter builder lets you compose conditions out of a field, an operator, and a value. Use it when the quick search is not enough, when you need a numeric threshold, or when you want to combine several conditions.

Click the Filter button on the filter strip. A small popup opens where you set one quick condition - a field, an operator, and a value - and click Apply.

For several conditions, AND / OR logic, or saving the filter as a preset, click Advanced... in that popup. The full Filter builder dialog opens. If conditions already exist on the tab they are loaded so you can edit them; otherwise the dialog starts with one empty row.
There is no hard limit on how many conditions you can stack.
The builder has one logical-operator dropdown for the whole condition list, not one per row. The choice (AND or OR) applies to every condition in the dialog. If you need mixed logic (for example, cpu > 80 OR (memory > 70 AND processes > 200)), nest by creating one preset for the OR group and one for the AND group, then use them together; the builder does not nest.
The field combo lists every field for the current tab. See Filter fields reference for the full set. Picking a field updates the operator combo to show only the operators that make sense for that field's type:
contains, excludes, begins with, ends with, equals, not equals.equals, not equals, greater than, less than, between.See Operators reference for what each operator does.
The value field changes shape depending on the chosen field and operator:
%.and between them, both with their own unit selectors.The default unit for each field matches the unit shown in the column on the data tab.
The dialog has three buttons:
OK is disabled while any row is incomplete (no field, no value, or invalid value).
Each chip on the filter strip is editable: click the chip to reopen the builder pre-loaded with that condition, or click the chip's x to drop it. The All match / Any match label on the chip strip is also clickable and toggles the whole filter between the two modes.