Display Settings - Change theme colour To change the theme colour of your Sandbox Studio installation, go to " Settings " > " Display Settings " (1) and click on " Update " in the " Colour Settings " section (2): You can now select your custom colours: Primary Colour . This colour is used for buttons, menu items, etc. Navigation Bar . This colour is used for the top bar of Sandbox Studio You can also change the colours that display for the dark mode. For instance: