How define my own size position in the window "New Order"

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How define my own size position in the window "New Order"?

[virtualreal]

Via 'Tools' > 'Options' > 'Trade' tab you can choose between the last used order size or define a default value.

HTH,

Jim

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I know it. I want change all pre-defined value (red rectangle in picture) and I want have my own set value here. See Example: (value picture)