I have been off AP for a few months. So do not know whether this observation applies to earlier beta version also.
In AP stable version, when single clicking on any adjustment (Level/curve/HSL etc), the adjustment layer opens.
In the present beta version, single clicking does not create the adjustment layer. Instead, the sub menu opens with icons
like default/darken/lighten (as appropriate) and one of these icons have to be clicked again.
I do not know whether this is intentional or not. Single click makes the work flow faster and hope single click method will be considered
to be retained in future release.
Best regards,
unni