On MAC OS. When using the french version of LR Classic CC the right side of the local ajustement panels are truncated (seemed to be outside the main window) whatever the size of the panel. When switch to english : OK So I assume this is a bug and not a setting problem.
I don't observe this behavior on my systems (windows 7 an Windows 10). No crop on the local adjustement panel. Can you enlarge the right panel ? What is the font size used (in Preferences> Interface tab) ?