To deactivate Earnings just follow these steps:

• Open the Bitso app and select Wallet.
• Go to the Digital Dollar (USDC) balance. 
• Open the Simulate earnings section.
• Tap on More info. 
• Choose Deactivate Earnings

From that moment on, your balance will stop generating yields, and any pending rewards will be lost. 

You can always re-activate Earnings any time you want.