The rulers are the white measuring spaces top and left of the document. The rulers show the position and width of pages and of frames and can be used to position tabulators among others. Uncheck this to disable the rulers from being displayed.
Y llefydd mesuro gwyn wrth pen y ddogfen ac i' w chwith yw' r mesuryddion. Mae' r mesuryddion yn dangos lleoliad a lled tudalennau a fframiau, a gellir eu defnyddio i leoli tablyddion a phethau o' r fath. Dadfrithwch hyn i atal dangos y mesuryddion.