Reject a memory card

[Richard33422368aqrh]

I cannot find an option to reject a memory card in Lightroom Classic.

[JohanElzenga]

I assume you mean 'eject', not 'reject'. What type of memory card are you referring to? MacOS (and Windows) uses a different method to access the latest fast cards, like CFExpress. The result is that these are not seen as memory cards, but removable hard drives. That is why Lightroom Classic won't show an 'eject card' option.