A blueprint, material, etc... window docked alongside the main viewport window will open in a separate window if the project is closed and reopened. You must hit "Restore Now" for this to occur.

Steps to Reproduce
  1. Open any project.
  2. Open a Blueprint and dock the window alongside the level tab in the main viewport window
  3. Close and Reopen Project
  4. Click "Restore now" option on load

Tab is restored in a separate window

Tab is restored docked alongside the main viewport window

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Won't Fix
Affects Versions4.
CreatedAug 23, 2016
ResolvedAug 18, 2021
UpdatedAug 18, 2021