I select the column by clicking on the appropriate letter at the very top of the table then clicking on the left edge icon under format>cells>border. It should add the border to the left edge of the column, but instead it adds it to the left edge, the top, and the right edge of that column. It doesn’t make any difference which column I select, the behavior is the same. By the way, I am using the “blank“ Numbers template. I have not tried this on any of the other standard templates included in numbers.
there isn’t much consistency as to whether or not the icon is highlighted, but the results are almost always the same: left, top, right. Sometimes, but rarely, it will produce the desired result and only add a border to the left edge of the column. I have never seen more than one icon highlighted at the same time.
The problem exists in other documents created using the “blank“ template. I haven’t tried it in other templates.
Thank you, Badunit.