Sets whether the edit box shows more than one line of text. When in multi-line mode, the edit box's height is determined by the number of lines shown and cannot be set directly -- enclosing the edit box in a ScrollFrame may prove useful in such cases.
Signature:
EditBox:SetMultiLine(multiLine)
Arguments:
multiLine- True to allow the edit box to display more than one line of text; false for single-line display (boolean)