Which Knoppix are you using ? Presume 6.4.3.

Are you using the CD or the DVD ? Presume DVD.

Did you select Main Menu > Preferences > Systems Settings ? Presume yes.

You have turned off "show windows from all desktops" for the KDE desktop. I doubt the LXDE desktop will honour this setting. The LXDE desktop is 'simple' and still 'under development' so I doubt you can do it.

If you find a way, be sure to let us all know.

Suggestion: ask one question at a time.

Hints: http://www.knoppix.net/wiki/Knoppix_Remastering_Howto and http://www.knoppix.net/forum/threads...enu-under-LXDE

Suggestion: try search or even advanced search before you ask questions for which there are already answers.