Introduction
GeoGebra uses JLaTeXMath (a powerful ally) to show mathematical formulas (text and symbols) using LaTeX. The first thing to remember is that LaTeX works in two modes text mode and math mode.
Writing text must be in text mode and writing mathematics in math mode. When checking the box "LaTeX formula" the text tool enters in math mode (font in italic).
\text{text text text}
or
\mbox{text text text}
Remark
This is an attempt to keep alive this post Comments:LaTeX-tips font size color box and math, from the old GeoGebra Wiki, available now only in the WayBack Machine. I still find it useful for reference when I am typing LaTeX in GeoGebra.
I also fixed a few typos, updated some links and images, and included an extra section with tools made by the community. I hope you find it useful. Let me know: Patreon.