You do not say how a track is being 'selected in from the library'. However...
You can set the default double-click behaviour in Options.
Open "Options", type "Playing" (without quotes) in the search bar at the bottom.
Look at the available options under "Behaviour". (Shown for you in snap-042 below)
Personally, I prefer to leave the default at "Replace (All)", and then, if I want something different from that, use the "More play options" menu that is available via the right click on selection. (Shown for you in snap-043 below)
-marko.