Hi Geiger!
I may have found a solution for you via the attached quick '90 seconds' YouTube video link: https://youtu.be/mZob1lPNuB4
It's called 'GarageBand Tutorial: How to Turn Off Hidden Echo and Reverb' with Toby Ryan. Though I do not know Toby personally, judging from the comments from others, some consider him a saint for the insights provided.
By default, Garageband has reverb turned on via the 'plug-in' settings whenever you start a new project. So, yes, you have to follow these steps every time you start a new project. But wait...
There's a bonus, in the last 20 seconds of the video, Toby explains how to create a 'custom preset' with all of the reverb settings turned off ahead of time. This a game changer (time saver), and I hope it works for you?
If this takes care of the question you initially asked, please respond so others in the community that land here will know we've got them covered. And more importantly, to know it helped you... awesome!
(Note: I followed/tested these steps directly in the most recent update of Garageband 10.4.3. I also have a Blue Snowball mic, and have used the built-in internal mic when traveling. But in my home studio, I use both dynamic & condenser mics with an audio interface to maximize sound recording quality.)