How can I stop the cloud generation?

The cloud generation will stop when the timetable with no pending cards and no constraints relaxed is found.

You can stop the generation at any time - just please note that closing browser tab, or generation dialog will not stop the generation. It will continue to run on the server.

You need to press the button "Stop" to actually stop the generation. Do not worry, all the results are saved and you can revisit them at any time later.