You can try solution from these questions1 or questions2 and questions3.
Or please try these steps as below:
- Enable IntelliSense:
- For all query windows, please go to Tools >> Options >> Text Editor >> Transact-SQL >> IntelliSense, and select Enable IntelliSense.
- For each opening query window, please go to Query >> Intellisense Enabled.
- Enable statement completion: please go to Tools >> Options >> Text
Editor >> Transact-SQL >> General, and check on Auto list members and
Parameter information boxes. - Refresh IntelliSense local cache: please go to >> Edit >>
IntelliSense >>Refresh Local Cache or use the CTRL+Shift+R keyboard
shortcut to refresh. - Wait a minute or two for the Refresh to finish before trying again.