You can only remove PIG/preview if you edit skin.xml file in skin map.
you have to remove line with PIG >> coding render="Pig"
example: this line
<widget source="session.VideoPicture" render="Pig" position="1228,30" zPosition="3" size="530,300" backgroundColor="#ff000000"/>
Search in skin.xml file this part of skin
<screen name="ChannelSelection"
and remove line.