How to remove the gray box of Apple 7plus desktop mobile phone information?

The steps are as follows:

1. Open the settings and click General.

2. Turn on accessibility and turn off assistivetouch.

Ps: what is assistivetouch?

Assistive touch is Apple's built-in software (above iOS5), which provides users with quick operation. It can move freely in eight positions around the screen with the opening and closing of different programs to avoid "getting in the way", or it can be adjusted manually.

When this function is turned on, a small box will appear on the interface of iPhone/iPod touch. Click it to pop up four function menus. This small square can move freely in eight positions around the screen with the opening and closing of different programs to avoid "getting in the way", or it can be adjusted manually.