Make Use Of:  “All the tools needed to make flowcharts in Microsoft Word 2013, 2016, or 2016 lie within the Drawing Tools. But first do these three preliminary steps:

• Maximize your page area. Collapse the Ribbon by clicking the little upward arrow (or click Ctrl + F1) on the extreme right so only the tab names show.
• Display the Grid. Click the View tab and click the Gridlines checkbox. The grid helps you align and size the flowchart symbols precisely as you can snap them to the gridlines.  You can also customize the gridlines: Page Layout > Arrange > Align > Grid Settings.
• Use the Drawing Canvas. Inserting any shape or “drawing” in a Word document automatically creates a drawing canvas. You will have to resize the canvas to frame your entire flowchart. As this Microsoft support page says, it is especially useful when using different shapes (as in a flowchart). Also, you can customize the drawing canvas itself to create attractive backdrops for your flowchart…”