Hi
@alfarisa_indahAs we know magento support multi-currency feature by default.
You can change from :
On the Admin Panel, go Stores > Settings > Configuration.
On the left panel, under General, select Currency Setup.
Open the Currency Options section,
Choose the primary currency for the Base Currency in the online transaction.
Assign Default Display Currency to the currency that you use to display pricing in your store.
In the Allowed Currencies list, collect any currencies you need for the payment in your store. If support multiple currencies, hold down the Ctrl key and select each option.
For more info:
Please have a look into the following document and update dollar to euro from
https://docs.magento.com/m2/ce/user_guide/stores/currency-configuration.html