The options in the sub-menu Sequence > Render All will render all clips in a sequence (images and sounds) that correspond to the render categories that are enabled ( ? ).
By definition, the category Full is not enabled. This category refers to sequences with real-time effects that can be played back and exported to video in full quality, without the need for rendering. There may be differences in Canvas between real-time playback and fully-rendered material. To ensure consistent playback quality in Canvas, enable (check) the category Full render, before rendering.
Additional information
For more information about controlling render quality and its settings, select Final Cut Pro User Manual from the menu Final Cut Pro Help.
