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Hi Linhl-0215,
Thank you for your question and for getting in touch. My name is Samuel and I would be more than happy to help you with your query.
The AppData folder contains the roaming folder and a local folder that contains app-related information, settings, and data about your roaming Microsoft account, as well as local information.
If AppData folder is consuming a lot of hard disk space then it could be due to some of the files related to certain application installed on your computer that you might not know about. You can browse around a bit and find out which one is in the folder. If any filename looks like or is related to any application that you don't use or require on your computer, you can go ahead and uninstall the application from Control Panel.
If the answer is helpful, please upvote and accept it as an answer.