This toggle function in Edit>System Settings limits cursor selection in model mode to filter out background entities in the current display view, (also available in Tools> Application Options> Position/Selection> Selection). Limiting selection to foreground objects, (Bodies, faces edges, etc.) can be useful in preventing accidental selection through face geometry to unwanted entities. Foreground selection works in all render modes including wireframe. This function does not impact position selection or drawing layouts.

Toggle ON/OFF:

Foreground Selection ON	Foreground Selection OFF