Recently I discovered the feature to move lines of text up and down,
Swap line down /
Swap line up. It's so helpful, but somehow I missed it all this time.
What's your favorite "hidden" feature of Joplin?
Edit: Please take "hidden" very broadly. If you feel inspired to post, then it surely will be hidden for someone. I've already learned lots. Just because a feature can be found in the documentation doesn't disqualify it from being hidden. Because who reads documentation!