Refresh all views simply starts the views from scratch, ensuring that all the data they are displaying is up to date. You shouldn't need to use this, as all the views should be up to date all the time! It's just here in case I've made a programming error. If you think that the WhiskerServer ever fails to reflect what's going on 'under the hood', feel free to try this; it won't do any harm. If you find a bug, please report it to rudolf@pobox.com.
The Status Bar option enables you to turn on and off the status bar (at the bottom of the window). The status bar tells you the function of all the menu items (watch it as you move the mouse over the menu).
Full screen expands the server display until it fills the whole screen. Press Escape to return it to normal (or use the menus, which are still accessible via ALT-key shortcuts).