More than 120 GB Hidden space in Mojave
You seem to be using the Mac App Store version of DaisyDisk. Download the stand-alone version (https://daisydiskapp.com/downloads/DaisyDisk.zip), it has more features. Then use the "Scan as Administrator" command to reveal the hidden space. Also before scanning make sure you grant DaisyDisk "full disk access", if you're on Mojave or Catalina. To do this, go to DaisyDisk Preferences > Full Disk Access tab and proceed with drag-and-dropping as instructed there.