When the palette area is expanded, there is a x and a pin up in left corner, click on the pin it turn and stand vertical, then it will not move regardles if you hold the cursor over it or not, you can drag to make the size they use smaller or bigger.
If you dont have any palette, go to Tool/ Customize/Options>>Palettes and check the one's you want to show, it will turn up in the way you select/ check them, or later when it is open you can drag the folders to your like.
It is easy for the palettes to jump out of area when dragging, to drag them back again will set them in the bottom of palette, so i normally go in to menu and set them on in the way i want them to show in my palette area.
V18, V19, V20, V21, 2015/ 16/ 17 Pro. Platinum
Deluxe V20, V21, 2015/ 16/ 17
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB