Problem with creating continuous splines

I started using shapr3d on my ipad pro recently and I am very pleased overall.
However I found it difficult creating continuous splines which go beyond the visible display area. For doing that first I tried to make two splines and then unite them, which wasn’t possible. Then I tried to move the sketching surface whithout lifting the pencil, which was possible, but only for one move. When I tried to move it once again it didn’t let me. I need to make a continuous spline because of the loft function.When I apply the loft tool for two sketches, which consist of different number of separately drawn splines the 3d body appears twisted in a way. I think there is something to do with start and end points of the splines. Any help would be very appreciated! Thank you very much in advance!

Can you show an example?