As Turtle91 says, the CodeView editing window does auto wrap while still properly numbering the lines. If you turn off wrapping (the default) then a horizontal scrollbar will appear if needed.
Also fyi, Plugins in Sigil can not modify the Sigil ui itself by design for safety reasons (to help prevent a plugin from crashing Sigil), so a plugin is not what you are looking for.
What version of Sigil and what Platform are you using? If Linux perhaps some desktop theme is interfering with the scrollbar being shown?
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