Tools > Measure > Delete Active Collection Measurements
Removes all of the measurements in the active collection, but does not delete the collection.
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This command removes all measurements in the active collection, but does not delete the collection itself.
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To see which collection is the active collection, click Tools > Measure > Edit Collections and note the name highlighted in the Collection Name box.
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You can also access this command by pressing CTRL+SHIFT+M or by clicking Delete Active Collection Measurements on the Tools toolbar.