In Business Calendar 2 we decided to use the default Google colors for calendars, while we intentionally dimmed them in the old Business Calendar (1). If you don't like the bright colors in Business Calendar 2 you can dim them in the settings.

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1. Open the Business Calendar 2 navigation drawer and hit → Settings

2. Select → Appearance here

3. Tap on → Dimmed calendar colors

4. Choose the option → Classic Colors to use dimmed calendar calendars in Business Calendar 2