Project Categories allow you to organize your projects and visually differentiate between assignments on the Team Schedule page using color codes.
Admin users can head over to Settings > Project Management Settings to set these up.
Next, scroll down to find the Project Categories section.
To add a new Project Category, click the Add Category button and select a name and color for the category. Click Save when finished.
This is how Project Categories, using their respective color codes, allow you to visually differentiate between assignments in the Resource Scheduling page: