On the Manage Acronis Secure Zone page, click Decrease.
Select volumes that will receive the free space after the zone is decreased.
If you select several volumes, the space will be distributed to each partition equally. If you do not select any volumes, the freed space becomes unallocated.
Specify the new size of the zone by:
dragging the slider and selecting any size between the current and minimum values. The minimum size is approximately 50MB, depending on the geometry of the hard disk;
typing an exact value in the Acronis Secure Zone Size field.