You can choose a color per service. You can adjust this yourself in 2 ways.
👉 Open and adjust service per service
1. Go to Settings
2. Activities
3. Click on a category of activities
4. Click on the 3 dots to the right of the service name
5. Click on the first icon (square with a pencil)
6. Select the desired color
👉 Adjust in the overview of all services
1. Go to Settings
2. Services
3. Click on "Overview" at the very top
4. Click on the icons next to "color" and "category"
5. Select the desired color per service or per category