TradeStation Help
The Grid tab allows you to format the horizontal and vertical gridlines and change the style settings for the TradeManager
Access using the menu bar Format > Window menu sequence and select the Grid tab.
Gridline Style
Displays a horizontal line under or through the window element of the active window.
Set as Default - Check this setting to save any changes that you made as your default.
Click OK to apply changes or Cancel to exit without changes.