Line spacing in Xerte

When I create a Gap Fill in Xerte, the line spacing as it appears when you publish is dependent on whether there is a gap in the line, so lines without gaps appear as "single line spacing", and lines with gaps appear as "1.5 or double line spacing. This is aesthetically unpleasing!

Is there any way to set the line spacing at say "double", so that within a text the line spacing looks consistent?

Best wishes

Jonathan