Comment 29 for bug 1243233

Like I said, the horizontal size of the overlay does depend on the current language.
In Portuguese (my native language), the texts are longer and the overlay doesn't fit (even with workspaces disabled), but in English it fits.

I think 1024x768 should be the minimum supported resolution by the overlay (in English, at least).
Maybe you should report a new bug (asking the overlay to be made smaller horizontally)?