This summary is not the rule. The rule text controls.
When a court holds a transfer hearing, it follows the same basic process used in a regular adjudication hearing. This means the standard rules about how evidence gets presented, how witnesses testify, and how the hearing runs all apply here too.
The one big difference is what evidence the court can actually consider. At a transfer hearing, only evidence that relates to the specific transfer factors listed in Article 862 can be brought up. This keeps the hearing focused on the real question at hand, which is whether the case should be transferred, rather than turning into a broader discussion about unrelated matters.
For someone involved in this type of hearing, this means you need to know what those transfer criteria in Article 862 actually are before you go in. Any evidence or arguments outside of those specific factors likely won't be allowed, so preparation should center on that narrow set of issues.