[Evolution] Access to that grayed area below subject

[allen meyers <texas chef94 gmail com>]

Been using evolution and loving it for sometime, Have been curious, but
never asked  That grayed area to right Normal and left of left
justifies, what must I do to get access to that. Excuse the non
technical description please. The only thing I miss about windows is
using word and its amenities to send mail and this has some of thar.