Moved your thread to the "Dev tools" forum, as the forum where you have posted is about addons.
btw: Without giving more info/details about how you have setup intellisense (to use the esoui lua files? you created your own lua files? what did you do to make that tool find the event and where is the event info stored? What lua files do you use? Do you use the txt file of the ESOUI_Documentation_Pxx.txt directly?, etc.) I guess there won't be someone who is able give you help
I do not know intellisense, so I might be wrong here. But other IDEs need you to install a lua plugin for the lua syntax highlighting etc. And then provide *.lua files containing the API functions, globals, etc.
Like IntelliJ IDEA is doing it, described here:
https://www.esoui.com/downloads/info...cessearch.html
Others:
https://www.esoui.com/forums/showthread.php?t=9875