Open the Display Preferences in System Preferences via the Apple menu: System Preferences > Displays. Then on the Arrangement tab make sure 'mirror displays' is turned off. Now you have two separate displays on your computer.
Now start Resolume and check out the Output menu. The Fullscreen and Windowed options enable you to select which of your computer displays the main Resolume output should go to.
For a straightforward single screen setup, Fullscreen is usually the option you want. Resolume will fill the complete window with its output.
Windowed output just fills the second output with a rectangle exactly the size of your composition. This is sometimes useful if you are using an external scan converter or are working with multiple applications.
You can stop all output by selecting the Disabled option.
If you accidentally went fullscreen on the main window, you won't be able to access Resolume's controls anymore. Don't worry! Just hit CMD-SHIFT-D to disable all output and get the interface back.
This will overlay your outputs with a numbered and colored image. The numbers will match the numbers your computer has assigned to those monitors.
A quick shortcut to get to your computer's display settings. You know, for when those numbers above somehow turned out wrong.
This will show a little FPS counter in the top left of the Output Monitor. This is an indication of how far you're pushing Resolume.
Higher numbers are better. If this consistently drops below 30, it means you're pushing things too hard.
Numbers higher than the refresh rate of your monitor are bad. It means you're not 'v-synced' and you're making your computer do more work than it's actually able to show.
Shows a handy little test card with color bars, the current resolution and time, and a moving diagonal line.
This will overlay each connected display with EDID information, which GPU it's connected to, and which GPU is currently being used for rendering.
Don't worry if the GPU listed under Gfx Card is not the most powerful card in your computer. This just tells you which card you are physically plugged in to. The GPU listed under Renderer is what matters and this should be your most powerful card.