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Depending on what tab is being viewed (Input or Output), the Details panel will have different controls. The Details panel's controls in the Input tab will also vary according to the selected 3 Comparison Type and whether a filter is a 12 Meta data field or 14 Table and column element, eg a free text filter cannot have 5 Predetermined values, therefore there is no "Add predetermined value(s)" button; and a 14 Table and column element cannot have a 11 Field applied to it, therefore there is no "Add field" button for such an element.
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The details panel is used to view more finely grained information and to edit a filter or value field anelement. Anything except the data, which an element works with, can be edited in the Details panel.
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The second panel being displayed in the image above (the one where the 1 ID is "sKeywords") has some buttons, which are not visible in the image (marked in red):
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