[рони]

miha2020,
блоку присвоить col-md-1, col-md-3 убрать.

$(function(){
$('.х_block').click(function(){
$('.left_block').toggleClass('col-md-1 col-md-3');
localStorage.setItem("blockIsActive", $('.left_block').hasClass('col-md-1'));
});
var blockIsActive = localStorage.getItem('blockIsActive');
if (blockIsActive != "false") $('.left_block').trigger('click');
});