It would be nice if Symmetry and/or the Symmetry button could be locked. Every now and then I accidentally turn Symmetry off when adjusting Intensity or pressing the current button below. The Symmetry button is also right underneath where a picture in picture tab often ends up on iPad.
At times when the symmetry action is not clearly visible, it’s easy to miss that it has been accidentally turned off.
On a side note: this is one of the most beautifully designed 3D apps I’ve ever used. Hats off to the developer.