NOTE: This is applicable ONLY for Wall-Generated Section Elevation views, not Custom Elevations/Sections cut on the plan.
To enable Skeleton Mode in your elevations,
Open the desired wall-generated section elevation view and navigate to the Quick Action menu
Click on the Enable Skeleton Mode icon
To disable Skeleton Mode,
Open the desired wall-generated section elevation view and navigate to the Quick Action menu
Click on the Disable Skeleton Mode Icon