How do I disable WebEx Assistant on startup for Mac? I dont want to remove the application completely, but I dont want it to launch automatically at startup.
Try System Prefs > User & Groups > Your name > Login Items.
Select it in the list & click the - button underneath
If it's not listed there, then check either
/Library/StartupItems/ to see whether it has an entry in there.
It's safe to remove items from there - though they will continue running until the next reboot.
If you want to be able to restore functionality in future, zip the file in situ then trash the original.