Penpower MyInk (iOS/Win) - Manual (Page 54)

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WorldNote PC User Manual
Moreover, you can also search for the notebook by its category. Click
the category name of the notebook you want to find in the notebook
category list. Then, enter the search text mentioned above to find the note-
book.
After typing the text into the search field, you can see the searching
result showing on the main screen immediately. You can close the search-
ing result by clicking
next to the search field.