How to shrink the subject of imindmap mind Mapping

We can find the expand All, Collapse all buttons in iMindMap's display toolbar.

After we select the theme, click on the target topic, then the subject branch in the map will be folded to the first level of the topic. It should be noted here that in iMindMap, we collapse the subject only to a single level topic, which means that the central theme and the first level theme are ultimately retained.

When we want to stand on the subject, click on the topic branch, click Expand All.

We also have another way to fold and expand, which is the shrinking node between the topics. We will see the "-" between the theme of the connection, click on the branch level can be folded to shrink, after folding to show the "+" number, click again to expand the theme.

This method only works on the branch of the topic, and cannot be used for all one-time folding expansion.