Display lines for 30 mins and hour cells when using Scheduler group by hour

1. You can override the default vertical line style to dotted using CSS. This works for the default theme ("scheduler_default"):

.scheduler_default_matrix_vertical_line { background-color: inherit; box-sizing: border-box; border-left: 1px dotted #eee; }

2. Then you can add custom separators at times where you want to display solid lines:

separators: [
  {color:"#eee", location:"2017-01-01T00:00:00"},
  {color:"#eee", location:"2017-01-01T01:00:00"},
  // ...
]

See also:
https://doc.daypilot.org/scheduler/separators/