Casio SF-4985ER - Manual (Page 42)

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PART 3 Data Management Functions
To unhighlight all dates up to a specific month
1. Press CALENDAR to display the Calendar Mode.
2. Press FUNC twice to display the second function menu.
3. Press 2 to select ALL DELETE.
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To clear the function menu without unhighlighting anything, press ESC .
4. Input the year of the calendar where you want the unhighlighting to end
and press TIME/DATE .
5. Input the month of the calendar where you want the unhighlighting to end
and press TIME/DATE .
6. Press SET to clear all highlights from January 1901 up to the month
you specified in steps 4 and 5 above, or ESC to abort the operation without
deleting anything.
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Remember that the delete operation cannot be undone.