Can I open my singleplayer world to multiplayer without exiting?

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Every now and then, I am playing Terraria and a friend on Steam asks if they can join. I then have to exit the world and re-open it as a server in order for them to be able to join.
So, is there a way I can open my world to Steam multiplayer (i.e. the equivalent of the 'Host & Play' option on the multiplayer menu) without exiting the world and re-joining?
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How do I make a single player world into a multiplayer world?
Delete the folder names "world" in the server's folder and move your singleplayer world into the server's folder and rename it to "world" all lower-case. Then run the "Run" file and the server should start up. You will need to use Hamachi to have your friends join, or you can port-forward.Can you share singleplayer world in Minecraft?
Open up Minecraft, and join your single-player world. Press the escape key to open up your Game Menu. Press \u201cOpen to LAN\u201d, then select if you want to allow cheats and what game mode you want the other users to have, then press \u201cStart LAN World\u201d.How do you change Minecraft single player to multiplayer on Mac?
Here is how to connect for Minecraft: Java Edition.How To Turn Your Minecraft: Java Edition Singleplayer World Into A Multiplayer Server For Free
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Images: Karolina Grabowska, Athena, Felicity Tai, Felicity Tai