In the QB app, when I mark an invoice paid how do I make the funds go straight to deposited funds? It automatically goes to undeposited funds.

Welcome and thanks for reaching out to the Community, @kinowl.

When receiving payment in QuickBooks Online (QBO), all you need to do is to change the Deposit to drop-down to correct account or bank. 

This way, the system will remember by the time you receive another invoice payment as long as it won't be changed back to Undeposited Funds.

For more information about the process, consider checking out this article: Record invoice payments in QuickBooks Online.

Please know that I'm only a post away if you have any other concerns. I'm more than happy to answer them. Have a wonderful day!