I sent the query asked by glory777 to Rick Meyers, the developer of e-Sword for the PC. I used https://www.e-sword.net/feedback.html and tagged it as a Problem. The reply came back within a short time, the same day, from e-Sword Support <support@e-sword.net> as follows:
The T4 Tooltip utility does a pretty good job of that. Based upon the amount of time it takes for T4 to process the text, one can imagine the algorithm required to do such a task.
In His service,
Rick Meyers
e-Sword for the PC (https://www.e-sword.net/)
e-Sword for Android (https://www.e-sword.net/android/)
e-Sword X for the Mac (https://www.e-sword.net/mac/)
e-Sword HD for the iPad (https://www.e-sword.net/ipad/)
e-Sword LT for the iPhone (https://www.e-sword.net/iphone/)
the Sword of the LORD with an electronic edge
Therefore, the suggestion by APsit190 in his video, Posted 17 January 2022 - 07:30 PM is valid. Here Stephen mentions that you can also select the version of the Bible that you want to be referenced, if you wanted only a particular Bible version to appear in the pop-up, instead of allowing the user to change the pop-up to appear dynamically in the latest selected Bible.