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Panel control menu
Right-click on the Panel to get to the Panel Preferencesmenu.
That will bring up the Panel control window, where I select the automatic show/hide option.
There are other options here for size and positioning of the Panel, but my next interest is the Items tab, where I can add to the contents of the Panel. I like to have a Weather icon and a Logout/Shutdown control on the Panel.
Obviously there are quite a few other items which can be added to the Xfce Panel.
If you prefer to have either Panel launchers or desktop icons, the menu is a convenient place to set them up. Simply click and drag an item from the menu, and drop it where you want it. If you drop it on the Panel, you will get a dialog to confirm creation of the new Launcher.
If you drop it on the desktop, the icon will be created without further confirmation.
Media player assortment
Linux Mint is well known for including media players and codecs that are optional in Ubuntu (which it is based on) and the Xfce version is no exception.
Under the Multimedia menu you will find Banshee, the GNOME Mplayer, the Totem Movie Player and the VLC media player. That has to be considered a good assortment in anyone's book!