> Note the grayed-out Edit and Create buttons.

Yeah... For some reason this has been the case for nearly a decade. [0]

But, if I remember correctly, there's a setting buried that allows you to enable unsigned macros, and _then_ those buttons will become available. It's just the help docs don't really go to pains to point that out.

[0] https://ask.libreoffice.org/t/need-step-by-step-instructions...