As the poster above me mentioned, it's just a matter of screen size. I have it set to adjust depending on the size of the screen but if it's a slightly larger or small phone than average, or a tablet or something like that then I unfortunately have little control over how it displays. I can try to make some micro adjustments later tonight but without specifics there's only so much I can do.
I don't use the programming language most common among Twine games. There's no save export and the layout isn't standard because this is all custom programmed by me. I started using Twine back in 2017 and taught myself to use it so it is what it is. I do not use templates, standard or otherwise.