Input monitoring button missing logic

1. How do I enable input monitoring in logic?
2. How do I change the input of audio track in logic?

How do I enable input monitoring in logic?

Turn on input monitoring for an audio track

In Logic Pro, click the Input Monitoring button (with the “I” icon) in the track header. Click the Input Monitoring button again to turn off input monitoring for the track.

How do I change the input of audio track in logic?

Click the Channel Mode button to switch between mono and stereo input format. Long-click the Channel Mode button, then choose an input format from the pop-up menu.