Editors

Default MIDI Editor: Determines which editor is opened when you double-click a MIDI part or when you select it and press Ctrl/Cmd-E. Note that this setting is overwritten for tracks with drum maps if the Use Drum Editor when Drum Map is assigned option is activated.
Use Drum Editor when Drum Map is assigned: If this option is activated, parts on MIDI tracks to which drum maps are assigned are shown with drum note symbols. The parts will automatically open in the Drum Editor on double-click. This overwrites the Default MIDI Editor setting.
Double-Click opens Editor in a Window/in Lower Zone: Determines where an editor is opened when you double-click an audio event or a MIDI part or when you use the key command assigned to Open/Close Editor.
Open Editor Commands open Editors in a Window/in Lower Zone: Determines where an editor is opened when you use an open command from the Audio or MIDI menu or the corresponding key commands.
Editor Content Follows Event Selection: If this option is activated, the parts or events shown in the open editor will follow the selection that you make in the Project window.