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You can literally sit anywhere you want.
/reload commandWith this Data Pack you can sit almost on every block.
To sit on any block, you will first need to craft a "Seat" saddle, then, while holding it in your hand, right-click on the block you want to sit on.
To remove a placed "Seat" you can just right-click on it with a sword of any type.
To uninstall the Data Pack run the command /function sit:uninstall. When the uninstallation process is completed a confirmation message will be sent in chat.