How to dsplay notes on margin?

If you look at the website of marginnote under features, it says that the app can display notes on the margin:

but I don’t know how I can see the notes (the comments that I have added tot marked sections of the text) while reading/annotating the text. When I do a pdf export, I do see the notes displayed in the margin, but not when I am reading / in reading mode. How do I display these notes in the margin? I use marginnote 3 on ipad

I found out there’s a small arrow on the below right side that can make it show up.

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