How to hide a column in bootstrap 3 without saving space?

Question

Bootstrap

The instruction has an offset* class. In this case, the column is hidden, but takes up space.
There is a desire to disable the column altogether when viewing on a mobile phone.

Answer 1

assign the class hidden-xs to the div

Answer 2

@albert_rar
Hides, but the place remains.

<div class="row>
   <div class="col-md-9 col-xs-12">
      Колонка 1   
   </div>
   <div class="col-md-3 hidden-xs">   
      Колонка 2
   <div>
</div>

Answer 3

additional media condition with display:none of the desired divs