I had the same problem on my tablet. After you select the booster, long hold the candy you want to paint. Once you do, you will see an outline of the boxes that will be affected. To change the direction of the stripes, just slide your finger to the left or right (without lifting your finger from the screen) until the…
I didn't know that you could choose the direction but I just found this video that will explain it: https://www.youtube.com/watch?v=kkdxydjun90 It has to do with the way that you swipe it. If you swipe it left to right or right to left then it will go across. Swipe it up and down and it will go that way. You just taught me…
Elsa, thanks, but your answer doesn’t fit my situation. I’m on an iPad so I don’t have a mouse, and the paintbrush doesn’t appear. The candy just goes to horizontal immediately. I have tried brushing my finger vertically, but the stripes still go horizontal. Thanks for trying to help.