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Please tell me how to make it so that the size of the main window can not be changed?
You cannot do that. The best you can do is make your game UI scale automatically to adjust to the new window size.
https://drive.google.com/file/d/0B-xiqK ... sp=sharing
If you are going to export it as NW.js (executable file to be run on desktop operating systems), you will have an option when exporting.
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