Placing Food in the Refrigerator at the End of Shabbat

Hello Rabbi, During the third meal, a person finished eating, and there were open foods left on the table, as well as dirty plates before the end of Shabbat. Is it permissible for him to put the open salads in the refrigerator so they do not spoil, and of course, without touching the plates to avoid preparing for weekdays?

Hello Rabbi 

It is permissible to place the food in the refrigerator so that it does not spoil, and it is not considered preparing from Shabbat to weekdays. 

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