Adjusting page width (max)

Site URL: https://rumahkeduamedia.com

I'm having trouble setting page width, I'm trying to compare it with other Squarespace templates, if they use page width (max) 1920px, it will appear to fit on smaller laptop screens , but mine looks like a bug and is too wide when I open it on a smaller laptop screen, can I solve this? only on my homepage. I want the site to look like this: https://siasatpartikelir.com/ both in small and large screens, still adjusting to the full content