When I use two fingers to pinch-and-zoom or rotate in the reference window, it only works a fraction of the time. The other times, it goes into color picking.

I thought it might be my setting to use the finger as the color picker, so I changed that to "Normal", but the problem persists even after restarting.

It is very streaky. It worked 5 out of 6 times and then it didn't work for 6 times straight.

I then suspected my long press delay setting. I changed it from 0 to 2 and now the reference window works correctly. I can even go down to 0.2 and possibly 0.1.

*shrug* Maybe this needs a fix or just a warning.

I'm on Artstudio Pro 2.1.3 on iOS 13.1.1 on iPad Pro 12.9 2nd gen.

Having an instant color picker would be nice. Currently you have to press, hold and wait. While this is configurable, an alternative would be to have a thumb-accessible button on the side to do this without delay.

I'm coming from another app where in addition to selecting a color, you can also select transparency or "full alpha". Is this possible in Artstudio Pro for iOS?