Moving the position of the zabuton appears to criticise the preparation of the host, so it is a good idea to avoid moving a zabuton which has been originally properly placed in position.
なお座布団の位置を手で動かすと、どうしても相手の用意の悪さを論うように見えるため、本来きちんと揃えられた座布団を座る位置にあわせて動かすのは避けた方が良いかも知れない。