Final answer:
To keep moisture from softening meringues, store them in an airtight container and consider adding more sugar during preparation.
Step-by-step explanation:
To keep moisture from softening meringues, it is best to store them in an airtight container. This helps to prevent the meringues from absorbing excess moisture from the surrounding environment.
Additionally, exposing meringues to direct sunlight can cause them to become too dry and brittle, rather than preventing softening.
Adding more sugar during the preparation of meringues can help to stabilize and strengthen their structure, which can also reduce the softening effect of moisture.