Audacity 2.3.2 - Time Scale effect

Greetings, after a long time without using, I searched for the “Time Scale” effect. I just found it in the list as disabled, and can’t activate it. Any tips?

I use Ubuntu 16.04 xenial

The effect has been renamed “Sliding Stretch” and it should be enabled by default.
Any listing of “Sliding Time Scale / Pitch Shift” is debris from an older version and can be ignored.