If you open the menu at the top right of the course overview (3 dots icon), you have the option to sort by name or last accessed date.
I didn't see it. My version is 3.2.9. Should I have to upgrade or there might have any plug-in for me?
Moodle 3.2.9 is no longer supported as of 17 May 2018, so yes you should upgrade to a supported version. Using the app with an unsupported version of Moodle will be unpredictable, and security issues are no longer being patched.