Can I change my return from mail to direct deposit?

See this TurboTax support FAQ for changing from mail to e-file - https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online/00/26985

Have you e-filed yet?   You cannot change how you want to receive your refund after your return has been e-filed and accepted.   If you have NOT filed yet you can change how you want to receive your refund in the FILE section by entering your account number and routing number for direct deposit.

you can mail your return and still get direct deposit.  you can change to e-file to get the refund faster.