The home button snaps the graph back to the default window centered on the origin. Use it when you have panned into nowhere. Zoom when the graph is off-screen is in zoom and off-screen graphs.
Lost, then home
Plus and minus zoom. Home resets. Do not sit on a blank plane hoping the curve appears. The keypad is a different leftover, in the keypad.
Desmos as a tool is in Desmos on the ACT.
The bottom line
Blank screen after a pan: hit home. Then zoom if you still need a wider view.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
This article offers general ACT prep guidance. The ACT can change from year to year, including its format, scoring, policies, test dates, and fees, so always confirm the latest details on the official ACT website at act.org before you make decisions. ACT® is a registered trademark of ACT, Inc. thirty-six is not affiliated with, endorsed by, or sponsored by ACT.