Photoshop white blank line

[Titanuim]

1. Version of the app : Photoshop 24.0
2. Platform and OS version : Win 10
3. Basic steps to reproduce the problem : New Document > save

How Fix that??

[PECourtejoie]

Hi, this is a preview artifact, it goes away if your zoom at 100%, or if you Shift+Alt+scrollwheel to stick to 50%, 33%, 25% increments that usually do not cause the background transparency to show up.