Multiple versions of same app
Ever since updating to Mojave whenever I right click on a file and choose "open with" it shows a list of apps, most of which show 2 versions (e.g. "Preview 10.0" and "Preview 10.1"). I'm dual booted and running off an external SSD with Sierra still installed on the original internal drive, but not sure how/why it'd be showing data from that drive.
Is there a way to either delete the older versions or if it is showing apps from the other drive to hide them?
MacBook Pro 13", macOS 10.14