In this article, you will have a better understanding of how you can show multiple currencies for an item on the Tablet Menu.
From App Configurations:
Click on Tablet Menu.
Go to Display Options.
Click on the currencies you want to show on your menu for your items.
After that, you need to go to the Menu Management page to enter the prices of your items in the new currencies you added.
Go to Price Options for the items on your menu.
Enter the value of that item for the currencies you selected earlier.
Publish the changes to update the menu on your tablet devices. Read More
The following video will also give you a clear understanding of the steps!