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To change the width of frame cells, select
Tiny, Small, Normal, Medium, or Large. (The Large frame-width setting
is useful for viewing the details of sound waveforms.)
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To decrease the height of frame cell rows, select
Short.

Short and Normal frame view options
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To turn the tinting of frame sequences on or off,
select Tinted Frames.
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To
display thumbnails of the content of each frame scaled to fit the
Timeline frames, select Preview. This can cause the apparent content
size to vary and requires extra screen space.
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To display thumbnails of each full frame (including
empty space), select Preview In Context. This is useful for viewing
the way elements move in their frames over the course of the animation,
but previews are generally smaller than with the Preview option.