Click the Edit menu option within the chart and select Chart Parameters. Scroll down to the "Additional Data and Features" area and look for the "Vertical Buffer" section. If you wish to auto-scale, you can choose to either "Scale to Fit Studies" or "Ignore Studies". To turn off auto-scaling, choose "Display Vertical Scrollbar" so you can adjust the buffer yourself.
How can I enable auto-scaling on TWS charts?
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How can I show position information on my chart?
How do I add or remove the tooltips on my chart?
How can I see the numeric values for high, low, open and close in TWS charts?
How can I see numeric values of TWS chart studies?