mmm, I may be able to help you
Option one, the good and old power on and off
- Press and hold the Sleep/Wake button until an option to “slide to power off” appears.
- Slide the power icon to the right, then wait for your device to power down.
- After about 15 seconds, press and hold the Sleep/Wake button to turn the device back on.
- Try to see if you can delete the app by holding down that app or going into storage
Option two, You may have a restriction
- Open “Settings“.
- Select “General“.
- In iOS12 and higher choose “Screen Time” > “Content Privacy & Restrictions” > “Content Privacy” > “iTunes & App Store Purchases“. In iOS 11 and lower, choose “General” > “Restrictions“.
- Enter the password set for restrictions.
- Set the “Deleting Apps” setting to “On/Allow” so that it is allowed.
Option three, Pre-installed app
I've got an iPad and iPhone of my own and looked to see what apps you can NOT delete, there is no option to delete (no x)
- Photos
- Camera
- Find my
- Settings
- App store
- Clock
- Wallet
the app you are trying to delete may be an app you can't delete as it came with your iDevice. What app is it ?
If you're trying to delete a pre-built app check this website Delete built-in Apple apps on your iOS 12, iOS 13, or iPadOS device or Apple Watch - Apple Support.
so if you are trying to delete these apps, well you can't as apple doesn't allow you to delete these
Cheers
Ethan