Hi Sander,
Unfortunately with the current FlexWidnow component it is not possible to create a window like what you need. We're currently working on a new set of windows/doors (slider,awning,casement,hopper...) and eventually I imagine we'll make something similar to what you need too. You can sign up to our newsletter to be notified when the next components come out.
https://flextools.cc/subscribe/

I'm trying to find out the cause but I have to admit that I'm not sure about the cause. Now I re-ordered the "remember me" module in Joomla to be the first to load. Please erase all your browser cookies, re log in with the remember me feature set and share with me if it helped or not.

In SU searches can be slow. but they do work

Layout of the church

1168 verzamel.pdf