The report fully reloads to the default settings when switching from Modern to Classic and vice versa, CindiJ.

For now, there's no option to prevent the system from reverting the date when changing between views. You'll want to use the Classic view mode before customizing the date.

Check out this article if you need more details about using the Modern view option: Customize your reports with a modern view.

You can always visit us again if you need anything else.