While zoomed in, you can move around an image by dragging with three fingers. Now, you'll be able to double-tap with three fingers to zoom in and out on Instagram or any other screen.
Then, on the Zoom screen, turn the toggle switch on. Head to Settings > General > Accessibility and in the Vision section, tap the Zoom setting. If you find yourself regularly wishing you could zoom in on Instagram, there is a setting that lets you zoom in on it or any other app or screen on your iPhone. There are two ways, however, for you to take a closer look at an image on Instagram on your iPhone. Unfortunately, Instagram does not let you pinch to zoom. Sometimes a photo shows up in your Instagram feed with some sort of detail that requires closer inspection.
