Hi @Brian Liu,
Great to know that and thanks for sharing the update here.
By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others.". And according to the scenario introduced here: Answering your own questions on Microsoft Q&A, I would make a brief summary of this thread:
[Microsoft List in SharePoint]
Issue Symptom:
How to edit create item form in a Microsoft List?
Current status:
We can use Power Apps to edit create item form in a Microsoft List. For details, please refer to this article: https://learn.microsoft.com/en-us/power-apps/maker/canvas-apps/customize-list-form?source=recommendations
You could click the "Accept Answer" button for this summary to close this thread, and this can make it easier for other community members to see the useful information when reading this thread. Thanks for your understanding!