[circonian]

By default, in xml code, the ZO_ChatSystem has a set width of 350.
They are not resetting the saved settings.width until after they call SharedChatContainer.LoadSettings(...)

function ChatContainer:LoadSettings(settings)
    SharedChatContainer.LoadSettings(self, settings)
 
    self.control:ClearAnchors()
    self.control:SetAnchor(settings.point, nil, settings.relPoint, settings.x, settings.y)
    self.control:SetDimensions(settings.width, settings.height)
end

But SharedChatContainer.LoadSettings(...), eventually, calls the SharedChatContainer:PerformLayout(), which is what blocks those tabs & puts them in the overflow container because it still thinks the desired width of the chat window is 350.

The saved settings.width need to be reset before the SharedChatContainer.LoadSettings(...) is called:

function ChatContainer:LoadSettings(settings)
    self.control:ClearAnchors()
    self.control:SetAnchor(settings.point, nil, settings.relPoint, settings.x, settings.y)
    self.control:SetDimensions(settings.width, settings.height)
    
    SharedChatContainer.LoadSettings(self, settings)
end

Just dump that in a code file & it should fix the problem. Would probably be a good addition to merlights Band-Aid