Want to turn your modern team site into a one-page communication site look and feel? You need to lose the Quick Launch then.
Easy peasy – click on Settings > Site Information > View All Site Settings.
Click on Navigation Elements.
Then untick Enable Quick Launch and save. (PS : Please don’t ever use Tree View, like ever, ew).
Done, go back to you home page and see the results.
If you want the top navigation to display too, turn it into a hub site.