Press [Original Feed Type].
Press [Batch] or [SADF].
If you will be scanning multiple originals multiple times, you must specify this setting beforehand. For details, see Batch, SADF.
In [Original Settings], press [Mix 1 & 2 Sided].
Press [OK].
You can select [Mix 1 & 2 Sided] and [Divide] at the same time. However, the function selected last has priority.
To switch the scan setting for additional originals to [1 Sided Original] after scanning one side of the last page of a batch of two-sided originals using the exposure glass, press [Change Setting], and then press [1 Sided Original].