When using a large data set, tooltips are automatically turned off for speed efficiency. To turn the tooltips back on for large data sets, you must set
"max-trackers" to a number higher than the number of nodes in your data set.
"max-trackers" is set inside the plot object.
I generally just make
"max-tracker":9999 unless I am dealing with a data set with more than 9999 points.
Example of large data set turning off tooltips:
Here is a demo of how `"max-trackers"` works: