Highlighting text in Notes

Mmm, don't know of any way to highlight text in Notes.

You can change the text colour:

ie: Select the text

Choose Format in the top menu,

Choose Fonts > show colours

Choose the colour

As previous mentioned by @brbo you can used the combination of Command t to change the font for specific text in the note.

You can change is to Bold, Bold Italic etc but Highlight - think not

Refer to image below

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