In the Changes screen, you can see changes made to the timetable. You can compare the current timetable with the Initial, Best, or Selected timetable. To undo a change, click on it and click on the Assign button in the Suggestions screen which will pop up.
Set up the filter to display changes you are interested in:
Select with which timetable you want the current timetable to be compared
Best Solution - best solution found so far (either generated by the solver or saved by the user to the best timetable found so far in the Solver screen)
Initial Solution - timetable initially loaded into the solver (it needn't be the same as the selected solution, since some classes might have been assigned/unassigned due to a change in input data)
Selected Solution - timetable selected in the Timetables screen
In the simplified mode, only the number of additional student conflicts is displayed for each change
When unchecked, more criteria are listed for each change
Reverse mode (current → compared solution)
When checked, time and room changes are listed in reversed order
A list of changes in time/room assignments. Click on any change to go to the Suggestions screen where there will be a suggestion reversing that change (an "undo" of the change).
Apply changes made to the filter
Export the list of changes to a PDF document
Refresh the screen