With the lock option, you can protect your selections.
Locking current selections
You can lock a selection by clicking in the current selection popup. The lock prevents any changes from being made to that selection. You can neither change nor clear a locked selection. If you have locked a current selection and then try to select excluded field values, a conflict arises and the new selection is removed. Normally, without locks, the new selection would replace the previous one.
In line charts, bar charts, and pie charts, locked dimensions have a next to the dimension name. If the filter pane is expanded, all locked values in the list have a .
Unlocking current selections
You can unlock a selection by clicking in the current selection popup. When you have unlocked the selection, you can make changes to it, or clear it.
