I suggest restructuring the main menu slightly, and I'm talking about the Mod Manager,
its name could be changed to Workshop&Mod hub, to include all the features in one place,
and move the Mod Manager to the new Workshop&Mod hub, where you have access to a Mod Browser and The Mod Manager,
as well as a create/publish mods tab, to make it easier to create/publish mods.
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Here is how it could be changed,
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Singleplayer
Multiplayer
Settings
Workshop & Mod Hub
Credits
Quit
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here is one with the tab open
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Singleplayer
Multiplayer
Settings
"Workshop & Mod Hub" Tab, "(Mod Browser, Mod Manager, Create
Credits
Quit
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and if somebody notice that it kinda Look likes Tmodloader's System From Terraria then yes, i feel like Tmodloader's System is easy to navigate, so taking inspiration from its Systems could help improving usability.
Also if somebody find an issues about this post, i will gladly hear about any of the feedback.