If the code snippets and object palette are in the same panel, you can close just the code snippets.
Just go up to the Main Menu -> View -> Code Snippets to close it. The Object Palette will stay open. Repeat the action to make Code Snippets reappear.
By the way, if you are interested in running the beta, there have been some performance improvements to the Object Palette in the beta. And several bug fixes all around.
You can go here to get beta if you want. Keep 13.3 installed. The beta won't run unless the most recent GA version is also installed. They will each use their own set of options so you can even run them at the same time.
-John