Quick Mockup Plugin v.1.4.11

I’m using and learning Quick Mockup Plugin and i’ve a doubt…

Going to Templates i can create a page clicking on one item and page will be created with this dimension:

375 x 812

Is these fixed values ?

So do i need to manual change to adapt for example to iPhone 12 Pro Max ?

I’ve also found an issue, after install it i see an alert about two missing fonts, are these fonts not part of installer ?