To disable sudden death, create a custom game scheme and set both Sudden Death Damage and Sudden Death Water Rise parameters to 0. For example, to disable Sudden Death in the Default game scheme, create a copy of that scheme and set both Sudden Death Damage and Sudden Death Water Rise parameters to 0.

I do not know how to do it?

Okay, putting things simply, you have to click the Edit icon (a pencil) next to the Schemes dropdown list (the second one after the Style). Once you're in the scheme editor, you'll see all options you can customize about a scheme. including 3 buttons: New, Copy and Delete. Use the Copy button to create a scheme copy. From there, you can customize the copied scheme by setting the Sudden Death settings the way I mentioned. Got it? Also, I can ask KoBeWi about this.

Thank you very much for help.