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Editing section

Clicking on edit boundaries
  (trimming) CINELERRA-GG not only allows you to perform editing by dragging edit boundaries, but also defines five separate operations that occur when you drag an edit boundary. Here you can select the behavior of each mouse button. The usage of each editing mode is described in great detail in the Advanced Editing chapter.
Keyframe reticle
  the options are Newer, Dragging, or Always. This is used to help in checking edit alignment across tracks. Always renders a line over all plugins, and dragging only over the drag icon. Never draws nothing.
Snapshot path
  designates the default directory path for snapshot and grabshot generated output.