That's outside the scope of the macro, but I would suggest you save this as a text snippet for whenever needed:
set tracks_window to title of first window whose title contains "- Tracks"
You'll then be able to reference the Tracks window like so:
activate application "Logic Pro X"
tell application "System Events"
tell process "Logic Pro X"
set tracks_window to title of first window whose title contains "- Tracks"
click checkbox "Click" of group 1 of window tracks_window
end tell
end tell