I am using Bryce 5.5 and was going through the manual looking for something else when I stumbled on this under the heading of Customizing Bryce.
 ***"To hide the Bryce interface, press Command/Ctrl+Alt. All the palettes disappear and your image appears at the center of your workspace. Press Command/Ctrl+Alt again to display all the palettes."***My question is what is the "Command" key on a keyboard, I don't seem to have one of those. 
In Corel's original version of Bryce 5 I used to be able to do this by Ctr+tab but lost that ability by installing the 5.01 patch. I used to love this function as it would give me a full screen render while rendering and made it a lot easier when plop rendering.

P.S
In this section it also tells you how you can move the palettes around by holding down the space bar and clicking on a palette. I had forgotten all about that one.