As of 0.15.12, if you use Command-Left Mouse for the keybinding for Open Item GUI, in the Blueprint Library, the keybinding to Open Item GUI does not fire. When I hit Command-Left Mouse, it instead selects the blueprint/blueprint book as if I had clicked Left Mouse normally.
This issue prevents editing or deletion of Blueprint Books exclusively in the Blueprint Library. Outside of the Blueprint Library, the functionality works correctly, opening the Item's GUI as intended.
Relevant link: viewtopic.php?f=18&t=48066
[0.15.12] macOS Keybindings - Blueprint Library & Overrides
Re: [0.15.12] macOS Keybindings - Blueprint Library & Overrides
Fixed for the next version.