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: