Samsung
Manage Calendar Colors auf Samsung
Samsung Calendar assigns every synced account a default color, which is why events from different sources often look identical at first glance. This becomes confusing once you connect multiple email accounts, a work calendar, and holiday entries at the same time.
The color assignment is handled in the app settings, not in the individual event, so changing it once applies to every entry tied to that account going forward. Existing events update automatically after you pick a new color.
Tap on Calendar ➔ Open the Menu ➔ Tap on Settings ➔ Tap on Manage calendar colors ➔ Choose an Account ➔ Set the Color
Repeat the same steps for each additional account or calendar you want to distinguish. If you only need to separate one specific event type, such as holidays, from the rest, check whether that source appears as its own entry under Manage calendar colors before changing an entire account color.
If colors still look identical after saving, the calendar view may need a manual refresh, or the account might not have finished syncing yet.