Go to Configuration → Tables.

Click on "Add Table" to add a table to your sketch.

Click on a table and without releasing the cursor, move it.

To change the shape of a table (they can be circular or square), simply double-click inside the table.

Click on the lower right corner of a table and drag the cursor to change its size.

Click on the x in the upper right corner of a table to remove it.

If you need to add a zone, click the button in the lower left corner.