how to reset to the main currency in other pages rather than the one selected

Hi there.
Thanks for the plugin, after searching a lot, it saved me.
But I have an issue.
I have chosen to show the plugin specifically on the checkout page.
And the rest of the website is supposed to show the prices by the main currency(USD).
but when changing the prices in other formats (for example in Saudi Rials) in checkout page and returning to the shop pages, adding some other products, all the prices are shown with the last currency chosen(Saudi Rials).
Need Help.