Samsung
Turn On/Off Screen Magnification auf Samsung
Screen Magnification is part of the Samsung accessibility tools and lets you zoom in on on-screen content without changing the display resolution. Two triggers exist for it, and confusing them is the usual reason the zoom appears unexpectedly.
The first trigger is a triple tap anywhere on the screen. Once enabled, three quick taps zoom the visible area in or out, which can happen by accident while typing fast or swiping.
The second trigger is the Magnification shortcut button, a fixed icon you can tap to zoom instead of using the triple tap. Only one of the two methods should stay active at a time, otherwise both gestures compete and the zoom triggers randomly.
Where to control it
Open Tap on Settings ➔ Tap on Accessibility ➔ Tap on Visibility enhancements ➔ Tap on Magnification ➔ Enable or disable Magnification shortcut. From this screen you switch between the triple tap gesture and the shortcut button, or turn magnification off entirely.
Turning both methods off removes the zoom function completely, which is useful if the screen keeps zooming during normal use. Turning on the shortcut button instead of triple tap avoids accidental zoom while scrolling or gaming.