Hi, Rashida!
Thank you for your reply! Yes, I noticed this option after I posted the question and I've already turned it off, so it's fine. I'm sorry I noticed it late...
But it didn't solve the main problem. The popup submenu should show two sections of the added module. In one row is the Headline addon and there is an Articles Scroller in a row bellow.
An Articles Scroller is meant to display content from three different subcathegories.
If I add another addon that is similar to Articles Scroller - for example, Article Slider - basically everything runs fine, but this addon displays the content vertically and I haven't found a way to edit it.
So I would need to know why Articles Scroller is missing or how to edit Article Slider...
Thanks in advance.
R.K.