I'm using Word Online and yesterday I opened my documents and suddenly found that the vertical columns are much larger than they were before. And the same in all my hundreds of documents this format... I supposed that the developers made that the vertical columns couldn't be less than 0.7 mm (conditionally), whereas before they were about 0.2 mm minimum. This is outrageous! I have all the documents now moved out, because they all mostly consist of tables and each one has several vertical columns of minimal size.