How to remove extra blank line below command line in vim?

I'm using vim 8.1.2292 on my MBP with macOS Catalina and this blank line under the command line really bothers me. How can I get rid of it?

Sorry, it wasn't a problem of vim but my Terminal app settings. Some space left at the bottom of screen as I scaled up the font size (damned myopia). It's not even a full line. Try scaling up or down a bit ('⌘' + '+'/'-') to get rid of it or at least make it smaller. Cheers!