How to fix noise in viewpoint?


I’ve found my viewpoint noise after modeling this for 3days.
And I’m curious about why my viewpoint goes wrong in layout tab while other tabs are just fine.

is there any way to fix this?

This is not noise it looks like overlapping faces (faces in the same position). I think you accidentally duplicated you objects.

This might be a precision issue, try changing the clipping values in the view tab of the viewport sidebar so they cover a smaller range (for instance 0.1 and 1000).