Here are the 7 settings you can change right after downloading iOS 18 on your iPhone:
1. **Rearrange Control Center screens**: In the editing mode, drag the controls to reorder their positions.
2. **Add or remove controls**: Tap the “Add a Control” button and choose from available options like Screen Recording or accessibility features. To remove controls, tap the (-) minus button.
3. **Lock or hide sensitive apps**: Touch and hold an app icon, then choose “Require Face ID” (or “Require Touch ID” or “Require Passcode”) to lock it. You can also hide an app by touching and holding its icon, choosing “Hide” and then confirming the action.
4. **Adjust Calendar view**: In the Month view, pinch with two fingers to zoom in or out. The Day view now has a Multi-Day view that shows two consecutive days.
5. **Improve movie and TV show dialogue**: While watching a video in the TV app, tap the More (…) button and then expand the Audio heading. Tap “Enhance Dialogue” and choose “Enhance” or “Boost” to improve audio quality.
6. **Customize your Control Center**: You can add, remove, or rearrange controls to personalize your experience.
7. **Take advantage of new features**: Explore the new features in iOS 18, such as locking and hiding apps, and adjust settings to suit your needs.
Remember that some apps may not be eligible for locking or hiding, and hidden apps will be locked when you launch an app or swipe away from the App Library.
Source: https://www.cnet.com/tech/services-and-software/change-these-7-settings-right-after-you-download-ios-18-on-your-iphone/