Tab completion

You don’t have to remember every command, or how it’s spelled. With the prompt open, Tab completes whatever you’ve typed so far:

• type :conf and hit Tab — the prompt fills in the first match and lists the others below it
• hit Tab again to move through the list; Shift-Tab goes back
• a one-line description of the highlighted command appears above the list

Completion also works on a command’s arguments. :theme followed by Tab walks through every installed color scheme, and Helix previews each one as you move through the list. Enter keeps the one you’re looking at; Escape puts the old theme back. On this site the theme you pick is remembered and applied again the next time an editor loads.

Try it in the editor. Type :theme and hit Tab a few times, then keep one you like — or hit Escape to stay with the default.