It is still possible to (right) click on the area to the right of the FOV indicator pane, and the equipment list will be displayed (i.e. Barlow lens), but selecting an accessory does not change the field of view if done so from here.
You need to choose the equipment list by clicking on the Contextual Menu button on the left side of the FOV indicator, whereafter the selected Barlow/Reducer will take effect.
We'll get this fixed/clarified for the next update. Suffice to say, it works properly done the as explained above. Please check it out for me.
Keiron Smith
Starry Night & Sky Safari Software Support Team