Having just upgraded to Pro 2.4.3 and then adding the Spyder 4.0.0 package, I was overwhelmed with tool tip windows while writing code in Spyder. From this stack overflow post, here's how to suppress them if you too find them a little too helpful as I have....
You need to go to the menu
Tools > Preferences > Completion and linting > Introspection
and deactivate the option called Enable hover hints.