Multiple Selection Mode
Find it here:
MOUS_ICO Menu: Landscape > Setup > Multiple Selection Mode
MOUS_ICO Toolbar: Setup: Multiple Selection Mode
Multiple selection mode makes it possible to select grouped objects as one item. This applies to grouped plant symbols, areas with leaders, etc.
Multiple selection mode set the AutoCAD system variable PICSTYLE to '1'. The PICKSTYLE system variable controls the selection of grouped objects and associative hatch patterns and their boundaries. The PICKSTYLE default setting is 1. The function Single Selection Mode will make it possible to select individual elements from a group.