@halcyon Apologies, it's something I ask when I see people post interesting apps, that exist as single windows; effectively iPad screens. Very few modern macOS developers seem to know how to, or care to consider, implementing settings / inspectors as a tear-off palette (the way all apps, including iWork used to be). For example, if you wanted to move the settings to a different screen, to maximise the main window space on a primary monitor, while not in full-screen mode.