Visually impaired user here. The "magnifier switch button" is the worst update to the magnifier settings so far. Having a floating button overlaying everything (defaulting to overlay over the keyboard) when zoomed in is a big hindrance.
With a magnified screen being difficult enough to navigate as is, having a constant floating button that overlays on top of the keyboard by default just makes things worse.
It was better in previous software versions where windowed and full screen magnifier had separate settings rather than a floating button. Please fix