Using New Outlook on Windows for professional communication and productivity
Dear @SiewLan Lim,
Thank you for posting your question in the Microsoft Q&A forum.
Based on your description, when you move emails from your Inbox to a folder you created, it automatically returns to the Inbox.
For better understanding your situation, could you please provide some more information as:
Which type of account are you using (personal account or business account)?
Does this happen to all emails or only specific senders?
Have you created any inbox rules that could be moving this email automatically? You can check in Go to File > Manage Rules & Alerts.
Please understand that the more information you provide, the more effectively I can support you.
Looking forward to your update.