If you have bookmarked a large number of sites on your online bookmarks page but only access a few sites regularly while the others are accessed infrequently, you can keep the groups for rarely used bookmarks collapsed. To do this, you have to click on the ‘-‘ sign on the right side of the group header.
This will heavily reduce the clutter on your page and you can always click on ‘+’ to expand the group when you need to access one of the sites within that group.
You can also click on “Collapse all groups” option at the top right to collapse all the groups and then selectively expand the groups that you are going to work with.