If you’re a developer (or public beta tester) using El Capitan, you’ve probably discovered that you can hide the menu bar (via System Preferences > General > Automatically show and hide the menu bar).
If you use this feature, and you’d like Moom to use the extra pixels afforded by the hidden bar, here’s how. Open Terminal (no need to quit Moom first), paste the following text, and press Return:
defaults write com.manytricks.Moom "Ignore Menu Bar" -bool YES
From now on, Moom will freely place windows in the top portion of the screen. This change will affect everything Moom does—those 23-ish pixels at the top of your display are now part of Moom’s real estate.
Later on, if you decide you don’t like the auto-hiding menu bar and disable it, you’ll want to also disable Moom’s use of that space—lest you find windows partially hiding behind the menu bar. To do that, go back to Terminal (again, no need to quit Moom), paste this text, and press Return:
defaults write com.manytricks.Moom "Ignore Menu Bar" -bool NO
With that command done, Moom will once again respect the menu bar’s real estate.