You can highlight texts in Note in the following way.
<Desktop>
1. Select texts you want to highlight and click “Highlight” icon in the lower of Note.
2. Select a color, and the texts will be highlighted.
<Mobile>
1. Select texts you want to highlight and tap ” A” icon in the tool bar.
2. Tap “Highlight” icon.
3. Select a color, and the texts will be highlighted.