When the process finishes, you'll see a green tick along with the word Completed.
Here's how to delete watched videos with the macOS Optimize Storage feature:
Using this nifty tool can save you the hassle of scouring your TV app library. In macOS, you can use Optimize Storage to automatically delete movies and TV shows you've already watched. Use Optimize Storage to delete movies from your Mac
Generally, macOS will automatically update the index, but sometimes it needs an extra nudge to get started. Spotlight will now reindex the drive, and, once completed, you should see all of your free space accounted for.
To free up space the easy way, install MacKeeper to quickly and effortlessly remove junk files, useless apps, and duplicates.
But videos aren't the only files that can fill up your hard drive, and a full disk can lead to decreased performance. Movies take up a massive amount of disk space. If your hard drive's looking a little full, deleting movies and other unused files can make your system run much more smoothly. Your operating system (OS) needs a certain amount of free space to function well, and too much clutter can affect performance and slow down your device. Over time, movies can accumulate and take up a lot of space on your Mac's hard drive, especially when you're downloading high-definition (HD) videos.