Apple 16 E iPhone clock turns blue up in the left corner.
I will go into places and my clock will turn blue in the upper left corner
Question marked as
When the clock turns blue on your Home Screen, it means a background activity is occurring. For example, you could be using a navigation app, like Maps. Or you could be screen mirroring to a Mac computer. If you force restart your iPhone, anything using background activity will be closed --> Force restart iPhone - Apple Support