Reply To: How to change currency?

Go to ‘WooCommerce’ > ‘Status’ > ‘Tools’

Next to ‘WooCommerce transients’, click the ‘Clear transients’ button.
Next to ‘Clear customer sessions’, click the ‘Clear’ button.

That should force it to change.
If it is still not changed, add a product to the cart and then remove it and it should be okay.