PeachPay’s Currency Switcher has a Gutenberg Block Widget that you can use in your Full Site Editor.
You can also view the screencast below to see how to add the Currency Switcher widget.
https://www.loom.com/share/d7e7941864794d668880da334c8812b1?sid=c9e0d042-e823-4786-96d5-183c2ccd4b81