Lock all slices – Adobe Photoshop CC 2014 v.14.xx User Manual
Page 932
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Note:
When you delete a user slice or layer-based slice, auto slices are regenerated to fill the document area.
Deleting a layer-based slice does not delete the associated layer; however, deleting the layer associated with a layer-based slice does delete the
layer-based slice.
You cannot delete auto slices. If you delete all user slices and layer-based slices in an image, one auto slice covering the entire image
remains.
1. Select one or more slices.
2. Choose the Slice or Slice Select tool and press the Backspace key or the Delete key.
3. To delete all user slices and layer-based slices, choose View > Clear Slices.
Lock all slices
Locking slices prevents you from resizing, moving, or otherwise changing them accidentally.
Choose View > Lock Slice.
Adobe also recommends
Work with slices in the Save For Web & Devices dialog box
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