How to change from a DPM (Display Parent Model) to a DCM (Display Child Model)

Hi there, I have sporting goods with 2 variations in terms of size. I would like each variation to have the size in the title showing- however, it looks like due to it being in the category ‘sports’ and a ‘size’ variation it is automatically in the DPM (Display Parent Model).

I would like to change it to DCM (Display Child Model) so it will show the size in each child listing. Do you know if this is possible? and how to do this?
Many thanks in advance