If you remove observables from a graph, they will disappear from the graph but remain in the platform. To delete observables from the platform, follow the steps below.
You can only delete published observables from the platform. Published observables are surrounded by a continuous line; draft observables are surrounded by a broken line.
Select the observable concerned or drag your cursor over a group of observables to select them all.
Right-click the observable or one of the observables in the group.
Select Delete from the platform from the drop-down menu.