Change Line Height of text in InkScape

• Select the text element whose paragraph line height you wish to change.
• Click 'Edit' in the top level menu
• Select 'XML Editor ...' (from the drop down menu) to see the following XML Editor. 
• Find and click the 'line-height' text (pictured below in the encircled text). To find 'lie-height', you may need to scroll to the right of the top right window. However, you can edit that line only in the bottom right window (pictured below with the pink fill). To be able to edit that line, you must click the line in the top right window.
• In this example, I had already edited the lines. The default if usually 1.25. Type over the value to whatever value you prefer. In some text elements, the values appear as percentages like 125%. 
• Click the 'Set' button (in the right corner of the border between the 2 right side windows). The line height of the text should change at this point.