You'll need to change each carving individually-it'll only take a couple of minutes. Right click on the board to change the board setting and set the thickness to .75. (if you choose the cutout in the carving list, then right click and deselect "Hide cutout" it may be easier as you can see the entire board. Put your cursor on a corner and right click to see the "Board Settings selection").
You'll see that a couple of the carves now carve through the board. Click on each object in turn and set the depth to .5 or your depth of choice wherever it now says .75.
Save it, load it, and carve it.
*OR--what Leo said!*
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George
Life is short....drink the good wine first!