Look for those in TEXT. Also there is Palette tab (you may need to turn it on from view/window menu on top). Palette shows all nodes, unlike that right click context list.
You can also disable context sorting in that right click dropdown list.
Btw Epic chated a bit with this dropdown list, that checkbox swaps between 2 list really, so you never know if you are missing nodes.
Best example for this is getting actor location, sometimes you get it from right click list sometimes it is only in palette (depends on node you drag from).
So always check PALETTE to see if node you want exists, then use dropdown list when you know it is there.