When you create a deal, deal amount you get always the rupees currency sign:
Also when your default currency in our case is EUR.
The only way you can change this is going to Desk, CRM Deal, Lead Details and change the currency field:
I don’t think this is the right way, it should automatically grab the default currency or you should be able to select the currency in the Frappe CRM app, instead of going all the way back to desk to adjust this.