Hello @finolaina
Thank you very much Nastia!
I have seen your screenshot, but what I want is different.
For a special post category I create a new sidebar, and I put the custom widgets.
The rest of post categories have the same sidebar.
I would like for the post of the special category to be able to “merge” the default sidebar (the one that has the other categories) above or below it.
I use a translator, I’m sorry if I do not explain myself correctly.
Again thank you very much!