OneMark converts LaTeX block into image by default. If you prefer native equation in OneNote, hit
Ctrl + Shift + Enter when exiting editing. You can also set equation as default output by customize CSS variables:
Image output is only for LaTeX block. Inline LaTeX can only be converted into native equation, because of OneNote’s limit.
LaTeX image output requires WebView2, which is automatically installed on Windows 11 and along with some Microsoft products. Click to install if you see a installation prompt.