After downloading emails in my inbox using the "Download Headers in this
folder" if I single click a header(left mouse click) then outlook will
automatically start downloading the email and if it is a large email then
the whole outlook will hang until the download is complete..

Is there anyway to disable this automatic download as I want to select email
header by a single click and then decide whether it should be downloaded or
deleted

This behavior was not present in the past and I am trying to understand why
outlook default behavior has changed.

Any advice are welcome.

Jean