Clearing 'On My iPhone' storage on iPhone 14 Pro

"Clearing 'On My iPhone' storage on iPhone 14 Pro: I am running out of storage on my iphone 14 pro and when I look into this the function "On My Iphone" is using 14gb. [...]How can I clear all this to free up some storage on my device please? You can individually delete but this would take me like a day to do.... can this feature also be turned off in the future to stop this happening again?"

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Troubleshooting iPhone Storage:

Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan. Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support

So, what to do...

Clear Space Using my User Tips:

• How to Clear Space from your Mobile Device, and What to Clear: - User Tip
• How to Clear "System Data" in your iPhone's Storage: - User Tip