It would be nice to have the same option as we have on regular Accordions. It is called: Behavior
"Should only one toggle be active at a time and the others be hidden or can multiple toggles be open at the same time?" And then I can choose: "Multiple toggles open allowed"
Welcome to our forum.
Please see there is an option "Keep expanded others" you can set "Yes"
See the screenshot
Hope this is work for your need.