Alt+ Tabbing between UEFN and Fortnite breaks when a new UI window is opened (regression)

Summary

When working on Live edit, Alt + Tabbing between UEFN and Live edit is incredibly important, especially in level design aspects where you build something in UEFN, go back to live edit to traverse it, jump back to UEFN to fix something, test again etc.

However, when opening a second window outside of the window of UEFN (like a second viewport), Alt +Tab no longer switches between applications.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

UI/Tools

Steps to Reproduce

Open live edit and keep it on the same monitor as UEFN
Alt+Tab (make sure you have other windows closed) makes you switch between UEFN and Live edit
Now open a second viewport in UEFN (different window)
Alt+tab again

Expected Result

Alt Tab switches between UEFN and Live edit

Observed Result

Alt+Tab does nothing

Platform(s)

PC

FORT-948564’s status has changed to ‘Ready for QA’. A member of the QA department is investigating the issue.