Lock and unlock Preferences fields

I use the macOS beta 10.15.4 (19E264b)


A piece of malware changed my default opening site to some other (browser hijack)


I used malwarebyte, following Apple's preconisations, but still the preference pane is locked and I cannot access the start page settings.


How do you lock and unlock those parts of the UI ?


TIA.

Replies

I should have pointed that the malware is gone, the start page reverted to my previous settings. But still I cannot edit the settings in the preference pane. The buttons and fields are shaded. Is it because the beta changed the way those are handled ?