Hi Leona,

I also have a visual disability, so I understand pretty well your problematic. 
The disturbing behavior of the magnifier you experience is linked to 2 
functionalities : the focus tracking and the caret tracking. Theses 
functionalities have 4 possible modes :
- none 
- centered (default for caret tracking)
- proportional (default for focus tracking)
- push
How theses settings affects the magnifier view is very well explained here : 
https://bugzilla.gnome.org/show_bug.cgi?id=708452#c7 .

Unfortunately and surprisingly, you cannot change theses settings in the
user interface. You have to do it with command line or a specific
software 'dconf-editor'.

In my understanding you should try at least to disable the focus
tracking, and execute this command in a terminal :

gsettings set org.gnome.desktop.a11y.magnifier focus-tracking none

The caret-tracking should logically be fine in centered mode if you want
the text cursor to always be in the center of the magnified view.

** Bug watch added: bugzilla.gnome.org/ #708452
   https://bugzilla.gnome.org/show_bug.cgi?id=708452

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https://bugs.launchpad.net/bugs/1935083

Title:
  Universal Access / Magnification / Zoom  tracking problem

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