Give a key contact a special name, color, or sound to help them stand out. In the contact’s direct chat, click the three-dot context menu of a chat window and choose Chat details (Figure 1):
Figure 1 Open chat details to access customization features
Click Customize and enter a custom display name, choose a color and sound, and assign a notification type (desktop notification, flashing chats) to accompany new messages from the contact (Figure 2):
Figure 2 Display name, color, sound, and notification settings
Note: These customizations are only visible to you.