Select Brushing Hide - Toggle hide Block from the Graph Data Editor shortcut menu or the Graph Data Editor Layouts menu to set all cases currently turned on (displayed) within the selected block of cases to turned off (not displayed) and all cases currently turned off (not displayed) to turned on (displayed). Appearance of cases turned off in the Graph Data Editor can be customized on the Spreadsheet Layouts - System tab, accessed via the Format - Spreadsheet - Layout Manager menu.