The presets for display labels are only shown if the "Display labels" function is enabled for the company in question. The lists assigned in the event take precedence over the standard lists of the company, but can be changed in the segment itself. (Enable display labels per company)
- Go to
Event > General. - Go to Pre-sets for display labels.
- Assign a
List for each of the Sizes S, M and L . 
Save your input.