Hi beawesome,
Welcome to the community! The Cash Flow planner is a great tool to forecast future money in and out events. I'd be happy to share more on this.
The Cash Flow planner was gradually rolled out to every QBO account and is now a default feature in the program. There's no setting available to remove this feature, but once the multicurrency option is enabled, the Cash Flow menu disappears. This happens because the Cash Flow Planner doesn't support multicurrency. Here's an article for your reference: Cash Flow Planner
So you could either turn on multicurrency or ignore the Cash Flow menu altogether.
I hope this helps to clarify things for you. Feel free if you have other questions.