How to remove a black floating icon on iPhone

Hello~ That’s a great feature called Assistive Touch. Click on below and review…

Use AssistiveTouch on your iPhone, iPad, or iPod touch - Apple Support*

Ways to turn on/off from article above…

• *Go to Settings > Accessibility > Touch > AssistiveTouch, then turn on AssistiveTouch
• Use "Hey Siri" to say, “Turn on AssistiveTouch”
• Go to Settings > Accessibility > Accessibility Shortcut, then turn on AssistiveTouch

I usually ask Siri to turn it off or on.

~Katana-San~

As described, you have likely enabled Assistive Touch. This feature can be disabled from your iPhone settings:

Settings > Accessibility > [Physical & Motor] Touch > AssistiveTouch > AssistiveTouch - set to OFF

Sorry but you’ll need to be more specific. Please post a screenshot of the offending object.

Take a screenshot on iPhone - Apple Support

For starters try force restarting your iPhone. This often clears minor glitches and issues.

Force restart iPhone - Apple Support