On this tab of the properties dialog box, you can modify the grating position relative to the insertion point and the thickness direction.
Justification
Specifies the grating thickness direction. The position can be changed from the bottom, center, or top of the element. For example, when selecting a justification of 0.5 (the default), half the element thickness projects in the positive Z direction and the other half into the negative Z direction.
Change top side
Switches the top side to bottom. The top side is represented by a special symbol in the model.
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Symbol displayed on the top | Symbol displayed on the bottom |