I found a section in the manual about crossfading clips on the same track, but such an effect does not exist in my v2.10 (running Win 10 Pro). What gives?
The current version of Audacity is 2.1.3 and is available here: http://www.audacityteam.org/download/
There has never been a 2.10 version of Audacity. If you mean 2.1.0, then that is very old. If you really do have 2.10, then I’d suggest that you uninstall it and run a full in-depth anti-virus / anti-malware scan.
Sorry, I meant v2.1.0. I have downloaded the latest version and everything looks good to go. Many thanks.