Picture: Where in the Paragraph tab you find the pop-up dailog box

Step 1. Choose the Home tab in Word and open the dialog box for Paragraph down in the right corner.

Picture: Setting up spacing in Paragraph

Step 2. Choose the line spacing in Spacing field and choose the alternative 1,5 lines.

Step 3. If necessary change the value to 0 in Before and After field.

Step 4.  Then choose Set As Default and pick the choice All documents in the dialog box and click OK.