you can use the first slider on the toolbar to set the minimum word length, default is 4 (or the third button on the toolbar if you're on phone or smaller screens)
the initial text on the site is the instructions. I can agree it's somewhat a questionable design, but I wanted to make sure that the instructions are there for newcomers and easy to clear for the regular users. So any action on the editor will clear the instructions, but the text you type is safe.
Someone commented something similar on reddit a while ago, and it is a very good argument to be honest. Still, you might find some situations where the tool might be useful and it's already deployed, so people can use it if they want
you can use the first slider on the toolbar to set the minimum word length, default is 4 (or the third button on the toolbar if you're on phone or smaller screens)