Hey,
I'm new to piefed, and this is already an issue for me.
Currently I am using a simple custom CSS, which is not completely tested. Instead of collapsing the bar, it put it at the bottom of the page, and attribute the whole width to the main column :
div.row {
display: block;
}
div.row .col-lg-8,
.side_pane {
width: 90%;
margin: 0 auto;
}
Hope it will help :3
~melimosa