Total Segmentator can not adjust labels

I use totalSegmentator to get the label of ROI.
I want to adjust the label. But, the buttons on Segment Editor seem unfunctional.
I want to shrink 3.0mm from edge of the label.
It will be appreciate if someone can teach me how to operate it.

TotalSegmentator extension in 3D Slicer creates a segmentation that can be edited in Segment Editor module if you select the segmentation and a source volume.

I successfully adjust the segmentation by selecting the volume.
Thank you for your reply!

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