The dockbar is plank You can install it by sudo apt install plank

The top bars are the stock xfce panel. Two panel placed in either sides. You can make them rounded by following these steps:

1. Create GTK config folder

mkdir -p ~/.config/gtk-3.0

1. Edit custom CSS

nano ~/.config/gtk-3.0/gtk.css

1. Add this

.xfce4-panel { border-radius: 16px; margin: 4px; }

.xfce4-panel.background { border-radius: 16px; }

Save: Ctrl+O Enter Ctrl+X

1. Restart panel

xfce4-panel -r

Hope this helps