Default font is SBL as I learned from customer support. The sole alternative is Ezra SIL. My issue is that I do not like the appearance of SBL. I prefer Ezra SIL. The problem is in your inter-linear pane the SBL is retained and apparently cannot be changed.
Does anyone have a work around solution? I include screen-shots for you're examination.
SBL (Default)

Ezra SIL

Inter-linear pane

The above inter-linear pane is retained regardless of your font selection.