help with updating configuration of site?

[moebius]

so, either I'm completely brain dead, this isn't possible, or something similar:
I'd like to update the look of my site, with something akin to 3 giant buttons (either side by side or vertical) taking the user to different product categories.
Right now, I'm playing with my test site and si_custom_theme template.  not having a lot of luck
assuming you understand what I'm looking to do, can someone direct me towards an appropriate set of instructions, please?

[Basara]

Hello.
You should start from Design > Layouts page https://abantecart.atlassian.net/wiki/spaces/AD/pages/11763764/Pages+Layouts