Method 1 for creating a Pattern on a Track:
Using the Keyboard Shortcut Action: "Insert a Pattern"
Important: This always creates a Pattern with a length of exactly 1 Bar.

Method 2 for creating a Pattern on a Track:
ALT (Option) + mouse doubleclick on that Track's Lane.
Important:
- Creates a Pattern with a length of exactly 1 Bar when ALT-double clicked outside Loop Markers.
- Creates a Pattern with a length of Loop Length, when ALT-double clicked inside Loop Markers.

Warm Regards.