Status bar is displayed at the very bottom of the application's window. It's separated into two panels:
Info panel shows various information during working with the program. It shows more detailed descriptions of focused user interface elements like buttons, and is used for displaying information about the program state and its last actions, like auto-saving.
Image size panel displays the size of the currently captured image. Note that if the size does not appear on the fixed sizes list, the "Add fixed size" command is active.