With the lock option, you can protect your selections.
Locking selections
You can lock a selection by clicking the lock icon 
in the 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 selection and then try to select excluded field values, the selection item will flash to indicate that the locked selection prevents the selection from being made.
Locked values Germany and Japan within the selection Region.
Information noteIt is possible to step back in the selection history to a state before the dimension was locked.
Unlocking selections
You can unlock a selection by clicking the lock icon in the selection popup. When you have unlocked the selection, you can make changes to it, or clear it.
Information noteWhen an app is saved using Qlik Sense, the current selections and locks are not saved. Selections and locks must be made every time the app is opened.