Thank you for your question
My name is ***** ***** I shall do my best to help you.
If you come on that visa then once you are married you can apply to remain in the UK and you do not need to return to your home country.
This is the reason for applying for this visa
Please ask if you need further details
My apologies - we are talking about two different Visa's
You are talking about a "Marriage Visa' where you do indeed have to go back to your home country to apply for a Spouse visa.
I am talking about what I regard as a Fiancee visa - which is detailed here