Changing system font size has never worked well for me.
Display scaling often causes more problems than it is worth for me as well.
$1 can work ok when no other tools, like ZoomText, are available.
* `Win + '+'` turns on Magnifier
* Zoom/magnification level is increased with `CTRL + '+'` and decreased with `CTRL + '-'`
* `CTRL + F` sets Magnifier to full screen mode
* `CTRL + D` sets magnifier to docked mode
* `CTRL + L` sets Magnifier to floating window mode
* `Win + ESC` turns off Magnifier
Just like with any other tool it's best to read the documentation and play a bit before you might need to depend on using it.
Do you only have JAWS or do you have ZoomText as well, called ZoomText Fusion when JAWS and ZoomText are bundled together? I will use Magnifier in a pinch but ZoomText seems to behave a bit better than Magnifier and ZoomText pairs very well with JAWS. Magnifier probably interacts well with Narrator but I cannot say I like Narrator much so I avoid it when I can.