Set the schedule to change design feature is supported in Magento 2 that helps you effectively create the variation of design and manage them easily. You will probably change your store design and theme many times to fit with your seasonal promotions, marketing strategies, even creation new images. Moreover, configuring the period of time to change the design helps you save time a lot and the new design will be changed well-timed.
Content. In the
Add Design Changebutton in the upper-right corner.
General Settings, do the following:
Storefield, choose place where the change applies.
Custom Designfield, choose the theme that you want to show when changing
Date From and
Date To field, set the period of time or schedule you want to change design
Ref: Magento 2 User Guide
It comes to the end of tutorial: How to Schedule Change Design in Magento 2.