The updated Platform has a retrofitted slide that gives it strong detents so the shelf will not slide away from you when playing even heavy controllers. However, sometimes this makes it difficult to separate the slide.
If you're having difficulties, please follow the instructions below.
Use the supplied Allen key to push in this location, lined with the edge of the rail. You will feel something being removed.
The rubber piece inside will come off.
Then lift the tab in the direction of the arrow using your finger, and pull out the slide while keeping the tab lifted.
Reattach the rubber piece when you want to reconnect the slide.
Please note the left and right slide will be in an opposite orientation.