Hello!

Thanks for posting in the Community!

You can easily create mind maps in Lucidchart using the mind map shape library accessible to users on an Individual Team or Enterprise subscription.

The following help article explains how create your mind maps either from scratch or using the above mentioned shape library: Create mind maps in Lucidchart (Japanese version here)

It is possible to collapse or expand the branches or your mind map as explained here: Expand/collapse branches

Let us know if you have any questions!