Open the AdminTool and go to the Applications tab.
Then proceed as shown here:
You can also manually edit the ApplicationPanel.ini file.
It is located here: C:\Program Files (x86)\TSplus\UserDesktop\ApplicationPanel.ini
It contains multiple values, all in the [ApplicationPanel] section:
bkgcolor = 0xfdfefe
header = yes
logo = yes
footer = yes
displayarea = center
logoffbutton = yes
nbrofcolumn = 5
displaytitle = Applications