The process for changing your currency settings on the mobile app depends on which device you're using.
For iPhone and iPad:
The language and currency that your Etsy app displays is based on your device’s international settings. To change these settings, go to Settings > General > Language & Region.
Your app's currency is determined by your selected nation next to Region.
Your app's language is the language of your device, provided that it’s one that Etsy supports.
For Android:
To change your currency:
1.) Tap the orange E in the top left corner of the app.
2.) Select the gray gear icon from the orange slider menu.
3.) Tap Select Currency.
Syncing between desktop and app
Changing your currency on your device will affect the desktop version of Etsy.com as well, provided you are signed in to your account in both places.
Note: You may experience a delay between setting your currency and seeing updated prices. If the currency doesn't automatically update for the page of the app you're viewing, try reloading the page or navigating away and then back.