Open Chrome
Click the three-dot menu
Select Settings
Click Privacy and security
Click Site settings
Click Notifications
Turn off Sites can ask to send notifications
Under Allowed to send notifications, find the site
Click the three-dot menu next to the site
Select Remove or Block
Repeat for other sites if needed
To stop all notifications, disable notifications in Chrome settings
To remove Chrome desktop notifications, open your operating system notification settings
Turn off Chrome notifications there