I can confirm that our team has encountered the same scaling issue on Linux. We are using Linux Manjaro with GNOME as well. After upgrading to UE Editor 5.2, we noticed that the main editor window and project selector appear 2x scaled, while sub-windows such as the Quixel Bridge window display at the expected resolution. This problem was not present in UE Editor 5.1.
We urgently need a solution to this issue as it is severely affecting our workflow. We appreciate any effort made to address this problem as quickly as possible.