Thanks but I'm still confused. When you click on the brush width size, the brush disappears and now you have no idea what size you're choosing until you click out of the sizing and then if it's not what you want, you have to make it disappear again then change the size; so you're going through this iteration again and again until you think the brush is the right size. How inconvenient can you get!
Please make the brush circle stay on the screen while you're sizing it and not disappear. Better yet allow the brush circle to be placed where you want it on the drawing while you're sizing it. If you look at other similar apps, the brush size stays on the screen while you change the size.