Add new table to Direct Query semantic model in Fabric

Hi,

I have Direct Query semantic model in a workspace, which is retrieving data from a lakehouse SQL Endpoint:

I have a report in ANOTHER different workspace which retrieves data from the mentioned semantic model (which is in another wokrspace). That is, semantic model and report are in different workspaces:

I don't know how to edit the semantic model. If I open the pbip file from power BI desktop, the connection is a live connection to the semantic model, not Direct Query:

So, if I try to Tranform data, it forces me to convert the model to a new semantic model in direct query (it doesn't change original model, but a new modle pointing to the original model).

How can I edit original semantic model in Fabric and be able to add new columns and tables form Lakehouse as a direct query connection to de semantic model?