From your SoFi Savings homepage, click on Vaults, and select the vault you want to close. From the details page of the vault, click on the Settings icon (the gear in the upper right corner) and click on ‘Close vault’.
The money in the closed vault will be immediately moved to your main SoFi Savings balance and any interest earned on the vault will be reflected as a distinct interest transaction in your savings balance at month’s end. Any scheduled deposits to and from your vault will be canceled.