Vertex theme: how to modify team member template to show members on 3 columns

Hello,

I am using Vertex theme from Elegant Themes, and i try to create a “team member” page using their template.

The page displays 1 member below the other, each member in one horizontal box per “line”.
but i would like to show the members in vertical boxes, so that i can put 2 or 3 per “line” (like on the picture in their documentation page https://www.elegantthemes.com/gallery/vertex/readme.html in “Adding Team Members” section).

Does anyone know how to do this?

Thanks in advance for any help
Cheers!