Instances window cannot resize down [789]

The Instances window, located in the Font Info panel, cannot resize down horizontally. The window defaults to a much wider dimension, compared to the other tabs (Masters, Features, etc.) and can only resize wider. Any ideas?

Glyphs Beta [ 789 ]
Yosemite 10.10.5

I fixed that.

Is it supposed to be fixed in version [ 789 ] or the next build? The problem is still apparent with [ 789 ]…


The upcoming build.

Okay. Thanks Rainer.