We have been adding custom elevation layers to our scenes and then sharing them via Experience Builder. We have created a series of bookmarks to turn on or layer various ground layers to represent various project locations and phases. However the only way to turn off the custom elevation layers is to use another bookmark that does not have them turned on or reload the experience.
Either through a ground elevation toggle is described in the Javascript SDK or by either by displaying these layers in the basemap or layer widgets.
