[Version]:
Artstudio Pro For iOS v2.3.27(530)
[Device required]:
Any iPhone with 3DTouch,my phone is iPhone8,you can use 6s,7,etc
[Method to reappear]:
Choose an any kind of brushes,enable the dynamic setting which make brush size changeing by pressure,then you paint on screen,you will find that if you stop your finger on screen(do not leave screen),the brush size will change into its maximum size,and paint on the place where you stop.But if you are painting without stop,everything is OK.