Store App - Default variations

Hi Balbooa,
I'm creating a simple store selling coaching sessions. I have one set of options letting the buyer select the duration and the second option allowing the buyer to select the meeting type Face or Online. I would like to force the buyer to select both the duration and the meet type. Both sets of options are required.

Both sets of options have the "default" option removed. However, the first set of options is still automatically selected by default - please see images. You can see the "6 hour session" is initially selected.

How can I force both sets of options to be unselected?

Secondly, when selling "coaching" there is no delivery and there is no downloadable digital file, which Gridbox product type would be the best fit (physical or digital)?

Many thanks,

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