Click on the Start Menu, then All Programs (just Programs for Win10)
Click on the Anaconda3 folder; mine is Anaconda3 (64-bit)
In there you should see Jupyter Notebook. If you have a virtual environment installed, it will be followed by the environment name like this: Jupyter Notebook (env)
Right-click Jupyter Notebook entry and navigate to More => Open File Location
Right-click the correct Jupyter Notebook entry, then click on Properties
Enter a path in the Start in: box; if the path has spaces in it, you must enclose it in double quotes
Delete "%USERPROFILE%" at the end of the executable path