Know what the feature enlarges
Amazon’s Screen Magnifier is an accessibility aid for the Fire TV interface. Its help page warns that most video content is not compatible with zoom. A magnified menu therefore does not establish that a film can be enlarged with the same control.
Decide whether the difficulty concerns reading interface text or fitting the programme picture. Those tasks belong to different layers. Changing the TV’s global zoom to solve a menu-reading problem can clip other content.
Enable the supported control
Open Settings, Accessibility, Screen Magnifier on the Fire TV. Amazon also documents a Menu and Select hold to toggle zoom, with directional controls for zooming and panning. Read the current remote instructions for the available magnifier mode before starting.
Practise enabling and leaving magnification on a simple menu. Keep the remote’s Back and Select positions familiar. Recovery is part of the setup because an enlarged view can hide the control you expected to use next.
Try a practical reading route
Open a programme page and inspect its title, synopsis and action buttons. Pan only as much as needed to read the information, then locate the intended control before selecting. A very large zoom may show readable words while removing useful context.
Amazon describes a Single Press Magnifier state with a yellow-arrow indicator. If that indicator appears, check the guide for the active mode instead of assuming the television has changed its aspect ratio.
Check playback separately
After starting a programme, verify the picture and playback controls in their normal supported presentation. Do not promise video zoom where Amazon explicitly notes incompatibility. Use the app’s documented picture controls only if they actually exist for that source.
For household use, keep a short note of the successful reading mode and exit action. This preserves a useful accessibility configuration without resetting the device when another viewer finds the menu unexpectedly enlarged.
Questions answered
Will Screen Magnifier zoom every programme?
No. Amazon warns that most video content is incompatible with the feature.
Is magnification the same as TV aspect-ratio control?
No. Interface accessibility zoom and television picture fitting are different layers.
Sources & further reading
Official references for the subjects discussed. Service terms and device software can change.