6. left & right switching function
click
graphic,you can change position of the left/ right 2 sides of tool bars.
7. page preview
(1)Open page preview popup: click
graphic, chosen status as existing shown page
(2)Add page: click
graphic,then you can add page
(3)Delete page: when opening page preview window, click right corner of delete button
graphic,the page can
be deleted;
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