In either environment, go to Sandbox -> Configuration Menu > General > User Interface Settings > Alma Logo and Color Scheme. There you can select a color and save.
Changing the color of the Sandbox environment will make it much clearer to users which version of Alma they are using.
This process should be undone every February and August, approximately, when the sandbox is made an identical clone of the production environment. The update will always overwrite the existing customizations in the sandbox, so the process must be repeated twice annually.
