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I don't get field to calculate on when I add a sum as aggregation

I am learning and practicing the creation of an app, following the steps of’s How to build, specifically “How to build a Quickbooks clone”.

Unfortunately, almost at the end of it, I run into a problem that I can’t figure out how to solve:

When following the steps to visualize the Bubble charts plugin, it becomes impossible for me to add a new aggregation or rather, I don’t get the option “Field to calculate on” that would allow me to indicate what I want to aggregate.

It is worth mentioning that in the Bubble manual this option appears while in the design of my application, it does not!

What you see (or don’t see) on my editing screen:

What it should show according to the Bubble manual:

Help me please!! Greetings!!