You can add a new availability or extend an existing availability on the selected day(s) after the cut-off day. When you click on Add in the Details pane, a new page opens up with the selected days information pre-populating the page. For example:
Click Apply to submit the changes and return to an updated Availabilities page or click Cancel to return to the Availabilities page.
The 'Quick add' action in the Details pane allows you to add Availability after the cut-off day using a Start and End time and a Start and End date. The example below makes you available from 9:30am on the 5th October to 17:30pm on the 6th October:
Click Apply to submit the changes and return to an updated Availabilities page or click Cancel to return to the Availabilities page.