Suppose you accidentally clicked off Wednesday.
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You do not see this day anymore, because you have set in the Eye-function of your calendar that you want to hide unavailable days.

1. Click the eye at the top right of your calendar view

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2. Then click on ''Unavailable days'' in the pop-up screen to show the non-schedulable days in your calendar.

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3. If you have enabled the unavailable days, you will see them (greyed out) in your planning board.
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4. Then move your mouse to the unavailable day and click on the slider to the left of the day name.

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Finally, you can hide the unavailable days again via the Eye.