Illogical interface to control the strokes of a table's cells
I find the interface to adjust the strokes of a table's cell utterly confusing and frustrating to use. For instance, I want to adjust the top horizontal border between two rows. If I click on the top bar in your interface (see diagram), select a weight and colour, InDesign changes the stroke of the cell's vertical bars?!
If I select the bottom bar in the diagram, it still changes the vertical bars.
If I attempt to guess the reasoning of how the interface works, I then chose to select the vertical bars in the interface, InDesign still changes the vertical bars. I can't win.
The way I would expect this to work, is that if I select a border's line on the interface, when I click OK, those selected borders will be the only borders affected. I, therefore, can't understand what the purpose of the little grid in the top of the interface is. No matter which border's line I click, InDesign goes off and does its own thing, making it impossible to stylise the borders between the cells other than by pure luck.
I also don't understand what the centre vertical line is for, to me, it has no purpose. I can't seem to find documentation that adequately explains how to use this interface.
Can the UI be adjusted as I have described so that it is predictable in its effect? I appreciate that I may be confused and it all makes sense to someone, but it is so counter-intuitive that I've given trying to use/understand it. Surely a different technique/UI could be employed? It is easier to draw a table in PowerPoint, take a screenshot and then pace that into the document, which is very disappointing.