If you choose the bookmarks bar folder, the icon and title will show at the top of your window.
You can edit or shorten the title or delete it so only the icon shows.
Click on "more" to manage your bookmarks and create new bookmark folders
If you have more bookmarks than the bookmark bar can fit, you can access your other bookmarks with the two right-pointing arrows *at the end of your bookmark bar), like a drop-down menu.
You can fit more bookmarks on your bookmark bar if you shorten or delete titles, like the image on the right.
The little puzzle piece icon shows more extensions if you have more extensions installed than the space allows.