Switching is possible by switching EN1 and EN2 pins High/Low.

For more information, please refer to this datasheet.
URL: http://www.tij.co.jp/general/jp/docs/lit/getliterature.tsp?genericPartNumber=lp8758-e0&fileType=pdf
Applicable page: Rev.A P.17
Applicable part: Table 1. Regulator Control ROW 7-10

*This answer is as of datasheet Rev.A.
Please note that chapters and drawing numbers may change when the datasheet is updated to a new revision.