After further investigation, we have discovered a workaround that partially resolves the issue. By using the
-nohighdpi
argument when launching Unreal Engine, the distorted window and menu sizes on the multi-monitor setup can be mitigated to some extent.
Additionally, we have observed that the “Enable High DPI Support” checkbox under ‘Editor Preferences > General > Appearance’ is enabled by default and cannot be disabled from within the editor. Even after restarting the editor, the checkbox remains active. This unexpected behavior may be contributing to the scaling issue experienced with the Editor UI.
Please note that while using the “-nohighdpi” argument provides a temporary solution, it may not completely eliminate the problem. We recommend developers to be aware of this workaround and take it into consideration until a permanent fix is available.