Collapsing some code parts enables you to focus on a given part of the code. By default, all elements are expanded when you open a file in the Source Editor. The following example shows a concept topic with every element expanded.

Imagine that you want to focus only on the first section element in this concept topic. You can collapse irrelevant elements to limit distractions and increase readability. The following example shows the same concept topic with some elements collapsed, in this case the second section element.