I solved a problem with Bluetooth mouse reinstalling some modules. I solved my communication problem but now I found that in my tray there are two icons of bluethooth. One is from blueman-applet, given by the original installation. The second and new icon is a Bluetooth configuration quite general and useless. I suppose is coming from Xfce.
Moreover, I would like to add to the icon showing the battery charge. It is not shown by default.
I cannot find how to configure icons in Xfce bottom tray. There should be somewhere a configuration file, I suppose.