To get to the Game Settings page, click on the cogwheel next to the Play button on your Diablo II:
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In Diablo II: Resurrected Offline Play for PC, community member Raxxanterax shared a YouTube video showing how to enable free skill resets. This process involves opening the game settings in the Battle.Net launcher and adding "-enablerespec" in the command line argument, which will allow you to freely reset skills from the character stats page.