Hiding the windows
There are a lot windows in Scribus: If you have opened the properties, the scrap-book, the layers and so on, you will not be able to see something from your document ...
Pressing F10 will hide all free flying windows. Pressing F10 again will bring them back. But - huh - not only the windows which were opend before, but all available windows will pop up on your document.
To avoid this, I changed the settings of my KDE-desktop: Under "Desktop/Window Behavior" I changed the setting for double-clicking the title of a window to "Shade". Now, with a double-click in the title-bar, the window is folded so that it is only as big as its title.