Original Code by NG3110@latchess.com, last version: https://www.mql5.com/en/code/10548

Added:

• Channel adjustments: press 1 to widen, press 2 to tighten channel.

Modified:

• Movable red dot (see the screenshot below).
• Lines on the chart.
• Input parameters.

Arcs:

Channel:

S/R:

Movable red dot: