Hi! I understand you're having trouble with Mila's Tools Unit Converter app where the screen won’t move. Let’s see if we can get that fixed on your iPhone running iOS 18.6.2.

Could you clarify a bit more about what you mean by "the screen won’t move"? For example, is the app unresponsive when you try to scroll or swipe? Or is the entire screen frozen and not responding to any touch?

Meanwhile, here are some simple steps you can try to get started:

1. Close and Reopen the App:
- Swipe up from the bottom (or double-click the Home button if your iPhone has one) to open the app switcher.
- Find Mila’s Tools Unit Converter and swipe it off the screen to close it.
- Then, open the app again and see if the screen moves normally.

2. Restart Your iPhone:
- Press and hold the power button along with a volume button until the “slide to power off” appears.
- Slide to power off, wait a moment, then turn your phone back on.
- Open the app and test it.

3. Check for App Updates:
- Open the App Store, tap your profile icon on the top right.
- Scroll to see if Mila’s Tools has an update available and update it if yes.
- Updated apps often fix bugs that may cause freezing or unresponsiveness.

4. Reinstall the App:
- Press and hold the Mila’s Tools app icon, then tap “Remove App” and confirm "Delete App."
- Go back to the App Store, search for Mila’s Tools Unit Converter, and reinstall it.
- This often clears corrupted files causing functionality issues.

If these steps don’t help, let me know what exactly happens when you try to move the screen or scroll. Also, tell me if the issue happens only in this app or with other apps too. That will help me guide you better!

Are you satisfied with these initial steps? If not, I’m here to help you further.