You can change which events appear on the timeline in a number of ways.
One way of doing this is to use the Resource Layout Editor menu.
To open this menu all you have to do is right-click on the timeline and select the Resource Layout Editor option as shown below:
This will open the editor.
To remove events, remove the tick from the boxes located next to each one.
To add them back in, simply tick them again:
The up and down buttons on the right-hand side will move the selected column left or right on the timeline. Up being left, and down being right: