Method 1
Click on the SAVE icon (CTRL + S).
In the Save As dialog box, click on Tools > Save Options.
You can change the Default file location as per screenshot. Click OK.
Alternatively, you can directly access the Word Options (as above screenshots) by go to File (tab) > Options.
Method 2
Open the Word Options (Tab > Options) and select Advanced. Scroll down till the General line. You will see the File Locations button. Click on it and you will get the below screenshot. To change the default location, highlight the Documents (File types) and click Modify.
