GregValiant 1,351
Cura is really a bunch of apps that work together. The Monitor App just sends your print to the printer so you are correct - you can't see your print there and you have to switch back to the Preview App. (As a note: Ultimaker doesn't maintain USB printing anymore, it hasn't been updated in a while, and you should probably consider printing from the SD card.)
Smithy's response covers the "Can't Alter" thing. Under "Extensions" on the menu bar you'll find a link to Thingiverse where there are lots of STL files to slice.
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Smithy 1,146
This is normally the case when you load a pre-sliced object (gcode) in Cura. In that case you can only send it to the printer but it cannot be modified. Maybe that is also the reason why you don't see the object.
So try to load an STL file, slice it with you parameters and then check if you see the model.
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