Popup with curve settings is somewhat broken, with Pen tool active. It immediately cancels, so user can`t reliable change curve parameters. See attached video.
The same popup with Node tool works ok, problem arise only when Pen tool is active. In 1.7.3 everything is ok too.
MacOs Catalina, Beta 163, Metal computing off
PenToolBug.afphoto
Screen_Recording_2020-01-15_at_13_46_20.mov