If I understand correctly, you want drop the top part of the magenta object down so it meets the other two objects. Pressure Load won't do that. Deform To Point might, but you have to increase the parameters considerably; say 50 for Resolution. I tried with the constraint points in various areas, but had no luck. I didn't get anywhere with the Chamfer Edges tool either. Maybe Subtract something out of there.
If you need to bring the bottom up, you can use the Facet Edit tool to rotate that face. You will need to move its Reference Point to an edge before rotating.
Would the Terrain tool or the 3D Mesh tool be a better candidate to make the magenta object? I think they would be easier to control.
Designer, Deluxe, (Professional, Expert, Basic), Platinum
Windows 10 Pro (1803), 64-bit