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In JChem for Excel chemical structures are stored in a hidden structure sheet. With this option group, properties of this worksheet can be specified.
Auto Clear Structure Sheet
If you delete a structure from your active worksheet, it can be still remembered on the hidden structure sheet in encoded format. With this option you can define if you would like to permanently remove the deleted structures from the structure sheet or keep them in the background, if this option is Default or Off.
If this option is On, it means that the deleted structures will be permanently removed from the hidden structure sheet, when closing the workbook and can never be converted back from the hash code to structure.
Structure Sheet Type
Default value is Normal, other possibility is AutoRepaired.