version ：Artstudio Pro 3.0.4（561）
device：iPhone 8
description：
1、hold the iPhone vertically，launch the ArtstudiopPro；
2、open color window on the right top corner，the color window is good；
3、after that，hold the iPhone horizonly，and open color window again ，the color window is no longer good,even you hold iPhone vertically at this time.
