Click the "Group" tick-box to add a tick and force the zone to use only the selected group/s. Click the "down arrow" to show what groups are available, and which ones are selected. In our case there is only one group (HeadWrinkles) and it is currently selected. TIP:- Like some other drop-down lists, this list toggles the items when you click on them... so if you click on "HeadWrinkles" the list will not only close but de-select the HeadWrinkles group. Frustrating. Click in an empty part of the underlying "SphereZoneProperties" window instead, or click "HeadWrinkles" to close the list but de-select the group, then open the list again and click HeadWrnkles to select and close (fussy behaviour!). Click "OK" to accept the change and close the window. The magnet will now only affect the HeadWrinkles group that we created in the earlier steps... including the odd 1/1/1/1 line pattern that I created to show why we can't/shouldn't paint patterns that tight.