Adjusting the layout for this modifier is the final part of the modifier UI project for 2.90. This layout exposes the most important information, the levels and subdivision controls, by default, putting other contols in collapsed subpanels. Note that there is empty space for the "Delete Lower" button that is still planned for 2.90. And there will also eventually be more items added to the "Shape" panel, maybe for 2.90. Differential Revision: https://developer.blender.org/D8187