So, I tried to follow your steps about additional tab, applied some module to that position, but that module doesn't load.
https://imgur.com/OiHBlDE
For the page heading and title, you simply didn't read my post careful or you didn't see screenshots that I sent.
Problem is that the
page title,
not page heading isn't showing correct. Page heading I have to remove in code, so that isn't issue here. It's page heading.
Here is settings on single menu item, single category:
https://imgur.com/8FdFPNA
Here is the page title display:
https://imgur.com/LSRLNO6
So the problem is, that on the PAGE TITLE it shows "Alone category"
Here is the code from page source:
https://prnt.sc/26qxel7
And here is from global configuration:
https://imgur.com/4oMAfbw
But, on single item menu view (single house), page title is OK!!!
https://imgur.com/4W223Xc
Still, when OS maps is enabled in component, maps still cannot be dragged in menu item category view, but in single item it can be dragged.
One more thing, please, you don't have to prepare anything specially for me, you just have to improve you component a little bit, and I'm sure that I'm pointing in right directions. I even promised that I will prepare 2 more translations for your component, to improve it, and all my suggestions and questions are honest tryout to improve your component.