Abord a STL file loading

My idear was to load a stl file created by hedges - software at my IPAD Pro
Shapr 3D began to load and the little sign shows the loading status.
But as it load 30 minutes I would abord the loading. but now I could even noitr reset my Ipad.
Can you help.
Thank you.

Ok, Now I could switch off my Ipad (Why it wasn‘t working befor I don‘t know). Then the loading was stopped.
Many greetings