Render Target for for UI white pixel border

No answers??? This has been asked for years.
Why are the settings for a professional finish on the edges of RT - using Unreal Engine 4/5 - a secret?

  • I have the same setup as you. Same Texture compression (and my tex res is 2048). And get the same unprofessional outline.
  • Yet I see games made with UE - their RTs look perfect.
  • What is the answer?