Need instructions on re-creating a website

Sorry where are the links?

https://postimg.cc/0zmCGYsN

So the current slider is small because it's responsive (it resizes for mobile).

Looks like your old slider was not responsive (it doesn't show the full image).

Unfortunately this is controlled by the slider plugin itself and not from the page hero settings in GP.

You will need to check with their support to see if there is a way to turn off the responsive setting.

so if I pick a slider plug-in that is nonresponsive, that would work for me?

It should. You could also use the same slider plugin from the previous site.