I phone 11 pro started hang after 14.7 update

What do you mean by "struck with all apps?" If the iPhone is unresponsive, then you need to try this. If your iPhone, iPad, or iPod touch won't turn on or is frozen - Apple Support

With this update, even I am facing the same problem with my iPhone 11 Pro Max. The processing of the phone has become slower. It keeps on processing when I select iPhone storage. Many a times it’s not able to show the used memory storage only.

How much free space do you have left on the iPhone? You should have at least 10% of your total iPhone storage space clear for optimal operation of the phone.

Around 145GB is free space now