The scheduler windows left pane indicates what projects that are available to the scheduler and their execution status. You can enable and disable jobs by clicking a project and toggling the enabled setting in the upper left corner. Jobs can also be deleted by right-clicking the job.
On the right side is a list of log files. All failed executions are stored as their separate timestamped logfile and the current log will be available without a timestamp. By clicking the individual logfiles the content will be shown below. Each log can also be opened in the default text editor by clicking the file and right-clicking and choosing open.