I found this and it worked for me.
Open file "/share/tuxbox/enigma/resources/rcdm5xxx.xml"
We are going to change Help button to be Video button.
Original version
<key name="video" code="27" picture="key.11" />
<key name="help" code="52" picture="key.23" />
Change it to be like this
<key name="video" code="52" picture="key.11" />
<key name="help" code="27" picture="key.23" />
Save this file in here
/var/tuxbox/config/enigma/resources/ (NOT WHERE IT WAS ORIGINALLY)
Restart Dreambox
Now every time you press help button with channel list open you can change the way you can view the channel list