I'm trying to delete that horizontal bar using Glyphs. I can delete the four points that create it, but have no way of joining the inner points back up again.
I've been trawling through the meager documentation for hours.
Because the points form part of the outline, it's not easy to remove the cross-bar. That part of the letter is formed by two different outline lines.
So: remove the line defining the triangular counter, and then add a point in the centre of the cross-bar and drag that to where the top-point of the counter was.
Select the rightmost two nodes of the crossbar, rightclick and choose reconnect nodes from the context menu. Do the same for leftmost two nodes.
This is described in the tutorial videos and the handbook.