When I select the lab color mode, many options are greyed out?

Can anyone help me .  When I select Lab color, many options are grey out.  The following are greyed out: exposure,vibrance, black and white, channel mixer, and selective color.  It worked perfectly the first time I used it but will not work now.  Do I need to reset something.  I have tried everything I can think of.  I use a PC and PS 5.
Thanks for the help.

I'm working on the Mac versions of CC and CC 2014. If I select Lab, those very same options are grayed out.

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