If you mean browser notifications, then (depending on platform and browser for specifics) you need to adjust the site settings for "notifications".
This is a task which "AI" isn't so bad - saves me typeing 😀
If you're getting YouTube pop-up notifications in your browser, you can disable them either in YouTube itself or in the browser's site permissions. (Google Help)
Option 1: Turn off YouTube notifications
Open YouTube.
- Click your profile picture → Settings → Notifications.
- Turn off the notification types you don't want, or disable all notifications. (Google Help)
Option 2: Block browser notifications from YouTube
Google Chrome
- Click the three dots (⋮) → Settings.
- Go to Privacy and security → Site settings → Notifications.
- Find youtube.com under allowed sites and remove or block it. (Google Help)
Microsoft Edge
- Open Settings → Cookies and site permissions → Notifications.
- Find youtube.com and set it to Block. (Reddit)
Firefox
- Open Settings → Privacy & Security.
- Under Permissions, click Notifications → Settings.
- Locate YouTube and change it to Block.
Quick method
While on YouTube, click the padlock/site information icon next to the address bar and change Notifications to Block. (Reddit)
If you tell me which browser you're using (Chrome, Edge, Firefox, Safari, etc.) and whether you're on Windows, Mac, Android, or iPhone, I can give exact steps for your device.