[Inkscape-user] Modifying the opacity of objects inside a group

Dear all,

I want to modify the opacity of objects inside a group. This is for a theme, so I need to do many such operations. Currently, I ungroup, select the objects, modify the opacity, group again, and rename the group. This is time consuming so I would like to go faster by not ungrouping the objects. So I try to enter the group and select the object. Unfortunately, when I do that, I always see the opacity of the objects at 100%, so it seems this is not the real opacity of the object and I cannot increase it.

Do I miss something? What am I doing wrong?

Thank you for your help,

Frédéric