Phone screen constantly going through each line with cursor and making loud clicking noise

Watch the GIF below

Settings > Accessibility >Switch Control > Switch Control [Disable]

Set sound and vibration options

1. Go to Settings  > Sounds & Haptics.
2. To set the volume for all sounds, drag the slider below Ringtone and Alert Volume.
3. To set the tones and vibration patterns for sounds, tap a sound type, such as ringtone or text tone.
4. Do any of the following:

• Choose a tone (scroll to see them all).
  • Ringtones play for incoming calls, clock alarms, and the clock timer; text tones are used for text messages, new voicemail, and other alerts.
  • Tap Vibration, then choose a vibration pattern, or tap Create New Vibration to create your own.

You can also change the sounds iPhone plays for certain people. Go to Contacts , tap a person’s name, tap Edit, then choose a ringtone and text tone.

Change iPhone sounds and vibrations – Apple Support (UK)