There is a button that you can’t click and doesn’t do anything.

Hello alon40,

From the screenshot you've shared we see the "Done" button behind your device information. This button is visible when you've selected "Edit Home Screen" on your iPhone. If the button remains visible when you're no longer editing your home screen we recommend restarting your device: Restart your iPhone

"How to restart your iPhone X, 11, 12, 13, or later

1. Press and hold either volume button and the side button until the power-off slider appears.
2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo.

How to restart your iPhone 6, 7, 8, or SE (2nd or 3rd generation)

1. Press and hold the side button until the power-off slider appears.
2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the side button until you see the Apple logo.

How to restart your iPhone SE (1st generation), 5, or earlier

1. Press and hold the top button until the power-off slider appears.
2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the top button until you see the Apple logo."

If the issue remains after restarting we recommend checking your wallpaper. You can change it by following this guide: Change the wallpaper on your iPhone

Should changing your wallpaper to a default option resolve this issue, then it is likely the "Done" button is part of the image you're currently using. To resolve this issue it will be necessary to use a new wallpaper.

Cheers!