There are date range filters at the top of the shift job calendar, by clicking the gear icons next to the labels you can control how many days into the past and present to load by default
In general it is not a good idea to load too far into the past or present by default, as this can significantly increase loading times as the quantity of jobs/data increases. You can always edit the dates by clicking on them for specific tasks, such as reporting.
If this doesn't answer your questions you can always contact us by clicking here