I'm using same version (996) on Windows and Linux. On my Linux computer for some reason Run / Debug dialog is way too wide. I have to manually shrink dialog width to get access for parameter buttons.
It seems that the reason for very wide dialog is very long VM parameter settings.
Also, for some unknwon reason the dialog is too tall. I tried to shrink it to get access for OK / Cancel buttons, but these do not show at all!