Shelf om right

Good evening, my shelf pops up on the right, the way I set it, but it is very finicky. I barely move off of it and it collapses right away. When I click to resize it, it dissapears. The top shelf shows me resizing it in 60% of the time, and out 10% of the time. The bottom shelf doesn’t resize out at all and disappears. I watched a video showing there is so much to do in this app but I just downlaoded this and having issues right away. I’m ready to purchase, so please let me know if these issues can get resolved. Thank you!