Great replies guys/gals, thank you.
The reason that I asked the question is that during the TR course the instructors taught us to deselect speed once we disconnect the A/P because of its advantages, as supposed to completely disengaging the A/T, and being new to jets, the 737, I did not realise the difference until I started my line training, during which some Captains would comment on why I chose to disengage the A/T and why not deselect speed, and others would strictly ask that I did disengage the A/T upon my request to deselect speed. Hence my question.
The manual says one thing, in the sim training you are taught another and on line one gets two different opinions.
Kind regards to you all for taking your time to answer my question, and safe flying.
SD