I've recently upgraded from SW 2015 to 2019 and I remember being able to choose a part configuration from an assembly model tree, but when i select the part right or left click the configuration drop-down is not showing up. Do I need to enable this, is it no longer available, or is my memory failing that this was a valid configuration selection approach.

I can choose the config i want by right clicking, opening the properties and selecting it.

but, if I left-click, all I see is this,

and if I right-click I just get this