Where in Garage Band 10 are Track Properties and Groove Main Track Selection?

Question

macOS

Hello, I'm studying Garage Band and I'll never know where this "I" button is, to open the Track Properties, I've already rummaged through the entire Internet. On the Apple site itself, as I understand it, the documentation is outdated, I have been trying to find it for 3 hours. Both in Runet and in English. Also, earlier it was possible to mark the groove track with an asterisk, but now it is not. Please help, I can't find it anymore
My Garage Band

This is what I can't find
https://support.apple.com/library/APPLE/APPLECARE_...
It opens the following window
https://support.apple.com/library/ APPLE/APPLECARE_...
And so, in the lesson, a track for a groove was selected, moving the mouse to the tracks and choosing an asterisk