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even if there are support for 4K and 1080p and other modern resolutions,
the game only displays 640x480 resolution for directx 9 and opengl.
The main menu is fixed to that resolution by default. The in-game resolution is what you change in the options menu.

You can use SuperFrontendHD to have the menu match the in-game res: https://worms2d.info/SuperFrontendHD