Hello,
In the old BP editor there was a Show Inherited Varaibles check box, i can’t find it with the new editor and i can’t get my ParentClass variables to show, i have to right click inside the graph to use them, i have been trying for too long :(. Please someone help me 
Hello,
In my blueprint tab, on the right to “+ add new”, click the “eye and triangle” to open sub menu (but i had to search too ^^)
Wow Wow Wow i would never have found that, thx a LOT Fen it was making me a little bit crazy !
Man I spent almost 1 hour in searching “Show inherited variables” lol new updated layouts feels like hide n seek 
Here is a screenshot : blueprint tab :
In 2019, same situation here 
Look at the comment above, It worked for me 2020.