In order to filter a Timeline, you first need to be on the Timeline screen. You can navigate there by either going to the main menu and selecting Insights and opening up the Timeline or by selecting Timeline on the Action Bar on the Points screen.

You can filter Timeline to see everything recorded for a specific Point, student, teacher, or show only merits, demerits, or Rewards.

You can also set multiple filters, like in the example above. For example, you could set a filter to see all merits for one or multiple students issued by a specific teacher.

Just click on the heading of the column for what you'd like to filter. You can add multiple filters to the same column too.