You need to read through https://ahrefs.com/blog/nofollow-links/ to understand what a nofollow link is achieving.

Xara PDF Help Manual:
Nofollow links You can find this option within the dialog Web Properties > Link dialog. When a link is set to Nofollow, it tells search engines that encounter the link not to follow it for ranking and
indexing purposes, for example if you link to another website outside of your domain.


Exactly how search engines use this information varies with each search engine and may change in the future.
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