as the title of the topic goes, when I single right-click on a picture in the Viewer it zooms to 1600%
It seems that there is no right-click setting here;

I think this is part bug and part feature request since 1600% definitely looks to be a bug as only the right click context menu is meant to show.
Still an options for right-click should be added under the same Settings>General>keyboard/mouse
Thank you