Native screen capture, one of the hottest features Apple introduced in iOS 11 and above, can easily be launched from the optional Control Center on your iPhone. From there you can stop recording at the same spot or via the red status bar or bubble. It's a very handy addition to iOS, but there's one obvious drawback – the red indicator that may appear in your shots.
When a screen capture is in progress (audio can even be activated!), IPhone X and other Face ID models will turn red in the status bar around the clock, while all other iPhone models will show the entire status bar at the top in red. Either way, screen capturing can be annoying, especially if you do it for work.
The annoying red bar or bubble that appears while a screen capture is in progress may be blocked by certain apps, such as Screen games, a few photo editors and others where the developer has completely hidden the status bar by default.
When you take screenshots in one of the apps that hide the status bar, Apple's native screen capture feature in the Control Center is a godsend. However, if you record the screen of your iPhone in an app that does not, you can use other options so that the unattractive red bar or bubble is never displayed.
Option 1: Use QuickTime on Your Mac
The best thing about the native screen capture feature in iOS 11 and iOS 12 is that you do not need to connect cables. However, it is necessary for high-quality shots without the red bar or bubble, unless you are drawing an app that hides the status bar.
If you have a Mac, you can easily capture the screen of your iPhone with the built-in QuickTime Player if you are using macOS 10.10 or later and QuickTime Player is version 10.4 or later. You also need a Lightning cable, so this does not work on older iPhones with 30-pin connectors.
This is a pretty straightforward process, and we've already covered in detail, so I'm not going to do it through here. But you know that this way you can record both video and audio, and the latter can be either the audio on the iPhone itself or your Mac's microphone if you want to do a voiceover.
The only drawback, which is not really bad, is that the time in the iPhone screen capture is always 9:41 and not the actual time.  Option 2: Third Party Mac Apps
Since there is an integrated way for your Mac to communicate with your iPhone (such as the QuickTime option above), other developers can use this system for their own apps use. One of my favorites is Screenflow from Telestream. It's a bit expensive, but the editing options you receive are reason enough to justify the cost.
Other third-party apps, most of which have not been personally tested, include Screen Record Pro by Xiaolei Zhang (9.99 USD) for Mac, Animatrice by Telethon KK (free) for Mac only, which steals the inclusion of QuickTime and not very good, LonelyScreen (14.95 $ / year) for Mac and Windows and Reflector ($ 14.99) for Mac and Windows, just to name a few.
Again, the only drawback of these apps (except the price) The time in the iPhone screen will always be 9:41 and not the actual time, just like with QuickTime. However, this only applies to the apps that you need to connect using a Lightning cable, not the apps that wirelessly mirror the screen to your Mac.
If you have a jailbroken iPhone, you can install a tweak of Cydia or Sileo to automatically eliminate the screen recording indicator forever. The SilentRecorder Tweak by Kiran Patil can be installed for free and works with modified iPhones running either iOS 11 or 12. Just search and install it.
SilentRecorder is enabled by default, although you can disable it at any time in the Settings app if you want to re-enable the screen capture screen. Remember, however, that you must forcibly close the Settings app whenever you enable or disable the tweak to implement the changes.
In addition to hiding the red screen capture bar or balloon, SilentRecorder also offers options for hiding indicators for phone calls, audio recording, location, and hotspot. All in all, SilentRecorder is a great improvement if you do not want to pollute your iPhone with unnecessary indicators.
Why other options have not made this list
Before the time of Apple's native screen recorder, the first appeared in iOS 11, there were a handful of iOS apps that you need to load to use them like AirShou, EveryCord, Vidih and VizoRec. These were not cropped because in most cases either a red indicator is still displayed at the top of the screen or the status indicator turns blue. The apps are not very reliable and some are not working anymore.
There are also some iOS apps that are in the iOS App Store that use Apple's paperless recorders to "stream" these videos to a streaming service like Twitch. These include Anthony Agatiello's EveryCord (free) and Mobcrush (free), to name a couple, but they fall victim to the same annoying red bar or blister you're trying to avoid using the native paperless recorder.