You can group levels together. To do this, put the name of the group in front of the name of the level and separate the names using a colon ':'.
For example, suppose we have the following levels:
To group these levels together, we rename the levels as follows:
You can name a level in the following ways:
The two levels now belong to the group called top.
On the Levels toolbar, the following changes can be seen:
You can show or hide a group of levels by selecting or deselecting the group button. When a level in a group or a group is deselected, its button has a border containing the colour of the group to indicate it is deselected. In the example below, level 5 has been deselected.
Each time you create another group, another group button is added with a different colour.
You can add and remove levels from groups by adding and removing the group name from the level name.