SOLIDWORKS 2021 adds functionality to lock rotation of slot mates, similar to lock rotation of concentric mates which has been available since SOLIDWORKS 2014.
The Lock Rotation option can be found in the mate PropertyManager or by right-clicking on the Slot mate in the FeatureManager Design Tree.
The Slot mate feature in the tree will show a solid-filled circle if the mate is in the locked state. An open circle represents the unlocked state.
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