To insert Latex code into the preamble section, you can highlight the backgorund of the text in OneNote with orange. This is mostly used to implement Latex packages with the \\usepackage command, as in the print screen below.

Select the background color that appears orange; it will display as 'Gold' when hovered over with the mouse pointer.

Alternatively you can use the “Project A” tag to do the same:

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For an easy start in choosing the right LaTeX packages, we recommend using our LaTeX Package Generator tool. It ensures that you follow best practices and select packages that work optimally with OneLatex—especially for handling references.

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Because the copy-to-clipboard function does not work with tags such as Project A, the Package Generator uses the orange background to highlight the packages for the preamble. This ensures that you can paste them into the OneNote initialization page exactly as intended and that they will work fine without any adjustments.