To do that, go to File > Options > Advanced and under the Display options, change the 'Show measurements in units of:' setting. If you want to specify a row height in millimeters, but Word is displaying the heights in inches, then you can either do the math conversion yourself, or you can change the settings in Word to display dimensions in millimeters. The template was created using a Table, so to change the row heights or borders, select the rows or columns that you want to modify, then right-click on one of them and select Table Properties.
You can use the lined paper templates for Word to print your own lined paper with different line heights or line colors.
Customizing the Lined Paper Template in Word
