How to use
When you hover your mouse above the table, you will see a handle appear on the far left of the row your mouse if above. Dragging the handle will allow you to rearrange the slots as you see fit.
When a slot is decreased to a duration of 0 minutes, it will turn red, and the minus button will turn into ❌. Clicking that cross will delete the row.
You add a slot either by clicking “+ add row” at the end of the table, or clicking the very small circle with a plus that appears by the drag handle when your mouse is there. That allows you to add a new slot just where you want it.
By default new slots are 20 minutes long, and you can adjust the duration of the slot using the buttons at the far left of the row, or by clicking the number and writing a new one. The start and end times are calculated automatically.