I've never done a manual recording, which I believe is what you are describing, so I can't speak for that scenario, but if you do a recording from the EPG you'd get the "keep number of episodes" option.
I supose that you mean the primary option "TV GUIDE". After selecting a program, I get following options:
at the top, the channel name, the program name and the start time
Record type:
Quality:
Pre-padding:
Post-padding:
and at the bottom, the options "Record" and "Cancel"
But I don't see the "keep number of episodes" option.
What am I doing wrong?