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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
；
