A thumb screw hidden beneath, allows the width of this shelf extender to be locked at any point. Here it is seen set to a double-lane product width. See the small photo inset for it set to a single facing width, albiet for a wide product. I have heard some store outfitters express concern that the extensions interfere with traffic and are a hazard to passersby. That may be, but I suggest if you use many extenders and shelf edge fixtures, aisle traffic will maintain a distance from the irregular front created. Whether that is good or bad, only you can decide. I just report the sighting of an adjustable extender in the field. If you implement, consider Push-Pin to help anchor to the shelf edge. The holes are provided at far right.
For a list of all horizontal shelf-edge research aids see…
“Shelf Extenders Tags” for a Scrollable list on FixturesCloseUp
“Extenders: Horizontal Shelf Edge Display“ as Pinterest Board
“Shelf Extenders Index Page” for all resources