I am unable to resize the item table whilst customising an invoice template

The video shows how you can select the item table and then drag it to resize it and how to delete a column from the item table by clicking the 'x' mark.

I have created a custom template, starting from the Classic default template.

When I hover over the table outlines, and then click or double click on it, I do not get these controls. Can you help?

I am using Chrome v24.0.

thank you