Adding a 64-bit Windows platform is not possible

I installed Delphi 10.3 Community.

For my new projects the default platform is 32-bit Windows. I'd like to change in 64 bits but the command 'Add Platform' in the Projet Explorer ("platforms" node) is not available (it is disabled). When I run theTools -> Manage Platforms command, the dialog shows that 64-bit Delphi Windows Community is installed. So, why the command 'Add Platform' is grayed ?

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