Database Tree window

Is there a way to enable a sliding bar at the bottom of the database tree window so you can just slide the bar to see names instead of having to enlarge the database tree window?

See attached image.

You mean a scrollbar, not sliding bar.

To preserve space, the scrollbar is disabled here. Instead, you can increase the width of the tree.

You can also disable the "Size" column, in right-click menu > Tree style options > Display size of objects, so there is more room for the names.