I designed a site on the Foster template and used a Gallery Grid block for the staff page. On desktop if you hover your cursor over the photos each staff member's bio appears.
However, on mobile you have to click a super tiny circle in the lower right of the photo to see the bios. I never knew this existed until a Squarespace chat support team member pointed it out. He recommended I reach out to the Forum to see if anyone has used custom code to enlarge this circle or to make the bio show up on default when the photo is clicked on a mobile device.
If anyone has experience with this, please share. =)