Hello Nguyễn,
My name is EngineTyme, an Independent Advisor and a Microsoft user like you and I would be glad to help you.
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I understand that you want to remove the dark theme in your MS Teams.
Please provide answers to the questions below to be able to isolate the issue:
- Are you using the new Teams on the classic Teams?
- Can you confirm if dark is enabled from your Windows setting?
- Are using a personal teams account or work or school account?
If you using Teams personal account, you could try to follow the steps below to troubleshoot the issue:
Select Settings and more More options button near your profile picture.
Select Settings Settings button.
Select General.
Under Theme, select Default, Dark, or High Contrast. Your theme will change to your selection.
Customize the Appearance in Microsoft Teams (free): https://support.microsoft.com/office/customize-the-appearance-in-microsoft-teams-free-51f24f07-1209-4f9d-8788-c0da4d98aede#:~:text=Customize%20the%20Appearance%20in%20Microsoft%20Teams%20%28free%29%201,Teams%20%28free%29%20restarts%2C%20your%20theme%20will%20be%20changed.
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Please let me know if you have any questions or concern.
Best regards,
EngineTyme.