Unable to pin notes and add tables in Notes, High Sierra
Solution 1:
If you’re signed in to more than one iCloud Mail account on your iOS device or Mac and have notes syncing turned on, you can only use the new Notes features with your primary Apple ID account.
https://support.apple.com/kb/HT204987
Add some notes to the On My Mac location (enable from Notes Preferences) — if you're able to use the features, it looks like the location/account you're using doesn't support those features.