How to refresh Data source model in the pentaho BI server console

Hi,
I use pentaho Bi server CE 4.8.0.
I created a datasource in the User console. The datasource connect to my oracle database.
Today, I added columns in one of my table.
Now I want to see these new column in my pentaho user console.

How can I refresh the data source model in the pentaho user console ?

regards

C