Changing Chart Shift range....

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The "Chart Shift" option shifts the latest bar from the right screen border to the chart shift mark. The chart shift mark (a gray triangle in the upper part of the window) can be moved horizontally with the mouse within 10 to 50% of the window size. The chart shift can be enabled by the button of the "Charts" toolbar or by the "Charts — Chart Shift" menu command.

This is a paragragh about the "Chart shift" menu..

I want to change shift rate, But I can't find any menu or option window about that...

Now My MQ4 has 20% shift rate..

Pliz help me to change fixed 20% rate..