MX

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If you select a modal tool from a flyout bar, that tool becomes the primary tool for that group. So you'll
then see its icon highlighted on the main toolbar.
There are also some flyout bars on the toolbar at the top of the window. Again these are used to group
together closely related operations under a single icon. This makes them conveniently accessible while not
taking up too much space on the bar.
See the Customizing chapter
in the pdf manual for more information on flyout bars.
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