I would like to ask if there is anyway to adjust the height of these hour cell? I have searched all the documentation but unable to find a way to change it, thanks.

I was able to change it by setting the style manually -
<WeekView.TimeTableCell
style={{height: 20}} />
Hello!
To achieve this, you need to customize the following components: TimeTableCell, TimeScaleLabel and TimeScaleTickCell (our private component). I made a small example to illustrate this: https://codesandbox.io/s/broken-cdn-kv864?file=/demo.js
Most helpful comment
Hello!
To achieve this, you need to customize the following components: TimeTableCell, TimeScaleLabel and TimeScaleTickCell (our private component). I made a small example to illustrate this: https://codesandbox.io/s/broken-cdn-kv864?file=/demo.js