The Batch Convertion Dialog is accessible through the Thumbnails Viewpop-up menu or through the Images item of the Top menu.
Current conversion settings are shown on the left pane of the Batch Convert dialog window. It looks like a tree with the Convert to, Resize and Saving options main nodes. Each main node has one or more child nodes that describe parameters of the target image type, new image size, where to save new image files, etc.