Help finding proper template

Currently the template I use is Supply template, but it doesn't use the whole page, it just 'extends my background colour to the edge of the browser' all I can find are templates that have navigation across the top, but I want one that has sidebar navigation. Does anyone know where I can get a template like that and download it or anything?

If you want sidebar then look here:

WHICH SQUARESPACE TEMPLATES HAVE A SIDEBAR?

• Avenue (blog only)

• Bedford, Anya, Bryant & Hayden (blog only)

• Five (good choice)

• Forte (blog only)

• Galapagos (blog only)

• Ishimoto (blog only)

• Montauk, Julia, Kent & Om (blog only)

• Skye, Foundry, Indigo, Ready & Tudor (blog only)

• Wells- also a good choice https://wells-demo.squarespace.com/

• Wexley (blog only)

• https://paigebrunton.com/blog/which-squarespace-templates-have   What?

I'm looking for more of a sidebar navigation that stays on the screen no matter what page you're on. Wells is the closest to what I mean, but still doesn't use the whole page. @derricksrandomviews

Did you check out five? The demo is not using sidebar but it has it for all pages pr per page:

https://www.usingmyhead.com/squarespace/five-squarespace-template-analysis