In The Sims 4’s Create-A-Sim (CAS) mode, the GUI (graphical user interface) can be hidden to provide a more immersive and distraction-free experience while customizing your Sims. Hiding the GUI allows you to focus solely on your Sim’s appearance and styling, without the clutter of menus and toolbars.
To hide the GUI in CAS, simply press the Tab key on your keyboard. The GUI will fade away, leaving you with a clean and clear view of your Sim. You can press the Tab key again to bring the GUI back at any time.