The status bar displays information, which is also available in the Statistics window.
The second field shows (Outstanding items + Outstanding topics + Final drill items)/(today's original Outstanding). It illustrates how many outstanding elements scheduled for the current day have yet to be reviewed (the first two numbers connected with a plus sign) or have to be rehearsed yet with the final drill (the third number, if present). For example, (24+2+3)/45 means that out of 45 outstanding elements, 24 items and 2 topics yet have to be reviewed, while 3 items require additional review in final drill.
The progress bar displays the graphic representation of the same information as the second field. The blue color shows the proportion of elements passed successfully today (i.e. passed with the grade Bright (5) or Good (4)). The red color shows the proportion of elements passed with the grade less than Good (4). And the white color shows the proportion of elements that have not yet been passed.
The right part of the status bar is used to display hints for menu items, buttons, statistical parameters, etc. As you have probably noticed, this part becomes yellow as soon as the mouse pointer moves over a screen component such as button, menu item, etc. You can double click the hint display area to turn the hints on and off. When hints are off (or not currently displayed), the field shows basic statistics for the current element: interval, priority, number of repetitions, and more