Open Chrome
Click the three-dot menu in the top-right corner
Select Settings
Click Privacy and security
Click Site settings
Click Notifications
Turn off Sites can ask to send notifications
Remove or block any sites already allowed to send notifications
On Android, open Chrome
Tap the three-dot menu
Tap Settings
Tap Site settings
Tap Notifications
Turn off notifications or block specific sites
On iPhone or iPad, open Settings
Tap Notifications
Tap Chrome
Turn off Allow Notifications