Hey Massaki,
you can try removing everything below line 253 in the “responsive.css” file, starting with the one that says:
@media only screen and (max-width: 1030px) and (min-width: 767px) {
apart from that, there are no small-screen specific CSS rules in the theme, so the elements will behave according to their floats and positions – note that on smaller screen sizes this might not be what is expected (which is exactly why the theme has specific small-screen CSS rules).
Sincerely,
Andrii / Satori Studio