I have seen several random reports of this happening but no quick solution. What OS are you using?
If this option was previously available to you, try resetting the preferences file. Go to Edit>Preferences>General tab and click the Reset Preferences on next launch button.
If that doesn't work, I suggest that you do a complete uninstall and reinstall of the program. Use this link to download the program for installation. Please report back if this works for you.
Your other option is to contact Elements support. You can start a chat session by clicking on the blue Contact Us button under the Support menu at Adobe.com. Or you can contact Support by telephone using the numbers listed here: https://helpx.adobe.com/contact/phone.html.