I think it could be scrollbars. If you don’t care:
:setglobal guioptions-=L
:setglobal guioptions-=l
:setglobal guioptions-=R
:setglobal guioptions-=r
:setglobal guioptions-=b
:setglobal guioptions-=h
Probably less relevant, but related:
The same behavior may be displayed in the menu bar depending on the plugins being loaded. Alternatively, you can select the "ascii" tab button panel
:setglobal guioptions-=e
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