shapefile - QGIS split vector layer gives me GPKG files but I need shp files

QGIS 3.6.0

I am new to QGIS software and not very technical on its deep workings. I am trying to split a .shp file using split vector layer. I need .shp file outputs but it auto creates .gpkg files.

I cant seem to find any settings that will change the default from .gpkg to .shp