Do a normal restart of your iPhone to clear up glitches — the gentle version of a reset.
On Face ID iPhones, press and hold the Side button and either Volume button together. On older iPhones with a Home button, hold just the Side (or top) button.
When the slider appears at the top, drag it to the right. Give it about 30 seconds to fully shut down.
Press and hold the Side button until the Apple logo appears, then let go. This is different from a hard reset — it's a clean, normal restart that closes everything safely.
Go to Settings > General > Shut Down, drag the slider, then press the Side button to power back on.