To determine the sequence of events within a track, you need to create transitions between your building blocks. A transition is made by connecting two or more steps in a track.
How to add and delete a transition?
Add a transition
On the canvas, hover over your step to see the 4 connected dots
Incoming connections: left and top of the step
Outgoing connections: right and bottom step
Click on an outgoing connection, a grey line appears, drag and drop the line to an incoming connection of a step you want to connect to
The two steps are now connected. You can always create more transitions from one step to another by repeating the above steps.
Delete a transition
Click on the transition, the transition side pane opens, where you can click on "..." at the top
Choose "Delete transition" to delete that specific transition
Alternatively, you can create and delete transitions using the step context menu.