In the Menu Bar, click Edit > Preferences, then on the left side of the dialog box, select MainWindow.
Show FPS in Status Bar - Show the current frame rate in the lower left corner of the Render View.
Show Rendering Log Messages in Terminal - Shows all log messages in the Terminal window during rendering.
Show Tool button Text - Shows hint text for buttons.
Window Opacity - Sets the opacity for all module windows.
Disable Docking - Toggles docking capability for VRED module windows.
Issue: For MAC 10.13.x users, once VRED 2019 is installed, the UI defaults to English, not the language you expect.
Solution: In VRED, select Edit > Preferences > MainWindow, then under User Language, set the language you want. Click Apply, then OK. Restart VRED.