Cannot add agent as next step in workflow

[rmaziarka]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

In the documentation there is info on how to connect Agent into the workflow:
https://docs.dify.ai/guides/workflow/node/agent

But when I follow this instruction I don't get this option in the menu:

What is needed to turn it on? Is it paid functionality (then it should be written somewhere)?

2. Additional context or comments

I tried both workflow and chatflow.

I have a few agents:

[Yevanchen]

Because this version has not been launched