How do I change the color of my labels globally?

To change to black

"global_label_color": "#000000",

under main "style"

First, in your Visualizer, you will want to go to "Group Variable"

Click "Advanced" in the dropdown

Click inside the window so when you press "Find" (command + F) for Mac and (Ctrl + F) on Windows, you will be searching in this window. Search for "style" which should be near the top of the window.

Here you can enter or edit the "global_label_color": "#000000" (this would make it black). If you don't see the variable "global_label_color" you can enter it manually anywhere between the curly braces following "style": Click "Save" and your colors will have changed.