To adjust a capacity, go to Settings → Capacity in the Admin and select 'View detail list' for the capacity you want to adjust.
You will now see the grid with all available time slots. Check the time slots you want to adjust. For example, you can adjust the filters so that the time slots you want to adjust remain. Then check the box at the top left of the grid to select all remaining time slots.
Selected time slots can be identified by this icon: 
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If the selection is correct, click 'Edit selection'. On the button, you will see the total number of selected time slots in brackets.
In this screen, you can specify what you then want to change for (all) selected time slots.
Here one can edit capacity, post a comment, adjust the 'active' setting and the price setting. In addition, a product can be hidden if it is not for sale within the time slot.
Note: Different dates in the detail list (e.g. closed for Christmas or capacity reduction) will not be skipped if they fall within the selection.
If the default capacity is changed from 100 to 250, then dates such as Christmas (if closed) will also be changed from 0 to 250, so please take this into account when selecting the capacity to be changed.
Note: When different sales channels draw from the same capacity, price types of other sales channels are also in this list.