Unable to edit CUI elements - greyed / locked?

[KeithSWD]

I have recently installed Autocad 2020 as a standalone installation on my Mac Book Pro.  I want to change the default double-click on blocks to the simple attribute editor as described here https://forums.autodesk.com/t5/autocad-for-mac-forum/changing-double-click-action-on-blocks/m-p/6058... but when I start the CUI Editor, everything is greyed out and I can't see a way to unlock and make it editable. I've done it on previous versions, so I've either forgotten how or something has changed....

The only option is to Duplicate the command and then edit that. But I can't delete the default definition, and on restarting Autocad there is no change in behaviour, so maybe I need to 'tell it' to use the Custom definition somewhere?

thanks in advance...

[maxim_k · Accepted solution]

Hi Keith,

>>>>I have recently installed Autocad 2020
But AutoCAD for Mac 2020 has not yet been released. Maybe you mean 2019 version?

Anyway, since 2017 version you cannot edit "predefined" commands in CUI editor. So the trick described in the discussion you referred doesn't work anymore.
The only way for now is to edit DoubleClickRoot.cui, which is inside AutoCAD application folder.

[KeithSWD]

Oops yes, that was a mistake, its 2019, I have 2020 on my desktop PC!

Thank you Maxim - always there with the answer!