The expansion of the boundaries

You can fix search box text by adding this css to layout.css

DIV.search_box input.button{
width:140px!important;
}

as for other things as I sated that template is not responsive so it simply behaves like that when resized.

Thank you. But white space on mobile devices right.

Our demo is not behaving like that

Tell me why in the positions user5,user6,user7,user8 the modules are not displayed horizontally

Difference between your site and our demo is that we use just user5 with single module.