Hi @Łukasz Jaremek​ ,

not sure where to start, the Unity Catalog cluster is the last thing you need to do.

To add/enable Unity Catalog in your workspace you need to create metastore.

Metastore is account level Object I would say. There are some requirements to create that metastore, i.e. storage and policies in azure. Then you need to create the metastore in the Databricks account and attach that metastore(storage adbfs://).

After you have metastore, you attach that metastore to the workspace. It makes your workspace Unity Catalog enabled - make sure do it in dev workspace, as once attached workspace to UC, stays UC attached.

Then the next steps are creating cluster (so far we didn't have to use the cluster, everything was azure and databricks api).

This explains well how to do it: https://learn.microsoft.com/en-us/azure/databricks/data-governance/unity-catalog/get-started

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2. I cannot create a new metastore (probably because I do not have special cluster).

I read the instruction and I do not have "Create Metastore" button (I am using Data Science & Engineering mode)

You shoud create metastore in the Databricks account (it's called E2 I believe), not in the workspace.