There's an option in Bootstrap to customize
your download of Bootstrap CSS to fit your needs. If you press the link customize
along Bootstrap's website, it will take you to a page that lists all the components and utilities that come included with the default download of Bootstrap CSS. You can add/remove any of these items to create a version of bootstrap that fits your particular needs.
For you case, remove the following options (Under Common CSS):
- Print Media Styles
- Responsive Utilities
There is also a section where you can customize and compile the LESS variables into a custom .css file. The one you could consider changing is the Media Query Breakpoints settings, but there are lots of customization options for you to browse through.
Take a look here at Bootstrap/Customize to see all the options you can change, and hopefully that will help!