Clicking the right mouse button in the background of an open album will display a pop-up menu of options and commands that apply to the whole album, such as the appearance of the thumbnails, the ability to publish the album, and other functions.
Clicking on an individual photo in an open album provides all the album commands described above, but also provides additional functions for the individual photo, including rotating the image, deleting it, or editing its name and description.
Right-clicking on a photo in an album pops up this menu