Hello Lee Eun Sung,

To remove the border of NForm in design time you need to put the code that you post in InitializeComponent method of the form.

However, it is not recommended because it may have unpredictable behavior.

Best Regards,
Nevron Support Team

NFrameAppearance frameAppearance = new NFrameAppearance();

frameAppearance.CaptionHeight = 0;

frameAppearance.BottomBorder = 0;

frameAppearance.LeftBorder = 0;

frameAppearance.RightBorder = 0;

frm.FrameAppearance = frameAppearance;

1) Before Coding

 2) After Coding

Why?

Please tell me how can i sizing for NForm?

Please tell me how can i change of design time for NForm?