It's called "Extend selection" if you want to use it in Find Actions to figure o...

garblegarble 9 months ago | parent | context | favorite | on: Show HN JetMove – Extra Nav and Multiple Caret Enh...

It's called "Extend selection" if you want to use it in Find Actions to figure out what it's bound to on your OS (e.g. on my intellij idea macOS bindings, looks like it's option+up)