Bryan Villarin writing for All Narfed Up:
When viewing a list on all platforms (Mac, iPad, or iPhone), you can filter by more than one tag.
Hit the link for details on how to filter on macOS and iOS. Things 3 is beautiful and can be simple, but there’s power for those willing to look for it. iOS itself is similar – it is simple for those who want an easy experience, with power features optional and out of sight unless you want them.