Hello @Oleksandr Kucherenko Thank you for contacting us on Microsoft Q&A platform. Happy to answer any questions you may have!
I see that you want to change default currency to EUR or USD. Please see https://azure.microsoft.com/en-us/blog/azure-cost-management-updates-july-2019/#currency It explains how to view costs in different currencies. Keep in mind that Cost Management doesn't convert one currency to another. Instead, it shows billed currencies.
Also, refer to this forum post - https://learn.microsoft.com/en-us/answers/questions/773930/different-currency#answer-774177
Hope this answers your question. Feel free to ping if you have any questions!
If the response helped, do "Accept Answer" and up-vote it