When I design an html template I don’t care if it’s portrait or landscape since it’s basically just one CSS attribute, but I tend to make all of my table measures on % to make sure it takes into account whatever page size it’s.
I suspect that this may help when designing a GDoc/MSWord template. If there is no option about a whole column’s width, trying to change the width on individual cells of the first row could do the trick.
For example, on MSWord, the default way table width is handled in my case is by cm.
If I make a table on portrait and change it to landscape after my table is made it won’t change size.
But you can manually asign a width on percentage and it will change accordingly.
I think that Greg’s solution regarding Tabloid is the easiest one if you don’t want to mess with % since the size of the items will be basically the same