How do I stretch this field so I can fully see the math formula without scrolling?
You can use this css code to scale your formulas
.MathJax {
font-size: 70%;
}
$$\ce{2Fe3Si2O_5(OH)4 + 6Mg(OH)*2 -> 2H*{2(aq)} + 2Mg3Si2O5(OH)4 + 2Fe3O4 + 4H2O}$$
With some advanced CSS (see this) you could probably achieve automatic scaling.
See also CSS Editor community plugin.
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It seems like you’ve got a very narrow width of your note, so you might look into changing that. Either through changing the readable line length, or by applying some css like the wide
class from Minimal theme.
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Thank you!