To remove dvars settings for your demo simply type the dvar names you want to remove in the Remove Dvars field (separated with blank) and modify the demo:
Please note:
only the dvar names are allowed, you can't filter a particular dvar value, every value being set for those dvars will be removed.
New in version 0.3.4:
Now you can use wildcards (* and ?) for dvar matching.
ex:
ui_hud_* will remove any dvar starting with ui_hud_