It’s part of the currency settings at the Company Gear at upper right corner.
From the home page > Gear at the upper right corner > Your Company > Account and Settings > Advanced > Currency > ON Manage Currencies > Edit currency exchange (or revalue currency drop-down arrow under action column).
OR
From the home page > Gear at the upper right corner > Lists > All Lists > Currencies
See also
QUICKBOOKS MULTICURRENCY IN QUICKBOOKS ONLINE US
WHICH VERSIONS OF QBO SUPPORT THE MULTI-CURRENCY FEATURE
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QuickBooks Multicurrency in QuickBooks Online US – Extensive Article