Document window keeps hiding behind palettes; how do I stop this?

My Photoshop workspace is a floating window, and one of the commands I most frequently use is the "Fit on Screen" command. Previous to a recent reorganization of my palettes, whenever I used the "Fit on Screen" command, my document window would resize to fit the available space on my screen, stopping where the palettes are on the right. That was great.

Now, after I reorganized my palettes and saved a new workspace, every time I use the "Fit on Screen" command, any landscape-oriented document window I'm using will resize all the way to the right edge of my screen, going behind the palettes. This is a major pain because now parts of the image I'm working on are hidden by the palettes, and it's annoying to resize that window since the bottom right corner of it is also hidden by palettes. How do I fix this w/out reverting to my old workspace, with a different arrangement of palettes?

Thanks.