I think what has changed is the behaviour of the command. In AC9 I got a pop up menu, click and drag to select the Detail I wanted to open.
In AC10 clicking on the button opens a dialogue box from which you can double click a Detail or select a Detail and then click open (and if you prefer toggle the button to open the Detail in a new window).
I preferred the AC 9 way but then I'm an old fart
AC versions 3.41 to 25 (UKI Full 5005).
Using AC25 5005 UKI FULL
Mac OSX 10.15.7 (19G2021) Mac Pro-2013 32gbRam AMD FirePro D500 3072 MB graphics