Unable to see system navigation gesture setting
Gesture navigation is available starting in Android 10 (API version 29).
Your phone is setup with gesture navigation because it is running Android 10+, but your tablet might be running Android 9 (based on your question tags).
Check to see if there's a system update for your tablet, otherwise you'll either have to;

Wait until Android 10 becomes available for your Lenovo Yoga Smart Tab.
Find an alternative launcher app you can install that contains gesture navigation.