when i started to learn PSP again a few months ago, it was the german version i installed before i discovered this forum and switched the language. In the german version the “adjust”-tab was visible from the beginning on. When i installed the english version i wondered that it was not and looked a few days ago for the setting to change it. I like to play with the instant effects.
The setting : file/preferences/general programm preferences/Tabs and activate “adjust” on the right.