My MacBook Air M4 makes a clicking sound

Not a design feature. A MacBook Air should not make random clicking sounds.

What you describe matches chassis flex noises. Common causes:

Bottom case screws slightly loose the thin aluminum panel flexes and “clicks.”

Thermal expansion when hot metal expands, relieves stress with a snap.

Slight misalignment of clips or posts inside the case → pressure releases with movement.

In rare cases, battery swelling can push on the cover (check carefully).

Service centers sometimes dismiss this because nothing is electrically wrong. But Apple does not advertise “clicking” as a normal design trait.

Fixes people report:

Tightening or re-torquing bottom screws in the correct sequence.

Adding thin Kapton or felt pads between the bottom cover and internal contact points to reduce flex.

Replacing the bottom case under warranty if the issue persists.

If the noise returned after they reseated the cover, that confirms it is mechanical stress between the cover and chassis, not electronics.

Recommended action:

1. Inspect carefully for battery swelling (trackpad bulge, uneven bottom). If any sign stop using and escalate to Apple immediately.

2. If no swelling: ask Apple to log it as a mechanical defect. They may replace the bottom case or the whole top case under warranty if you persist.

3. Document the sound (video/audio) so support cannot dismiss it as “normal.”