Hey Peter,
I've checked on your site, it seems like your current template still available for this module position 'es-dashboard-between-streams', so you can assign your module to this position.
You also can append this
?tp=1 into your browser URL address bar , for example :
https://www.in-mymind.com/de/netzwerk/everyone?tp=1 , so you can see which module position available in Easysocial.
By the way, may i know which module you trying to assign to show in this module position 'es-dashboard-between-streams' but it doesn't show up? Because i did a test on your site, it did show correctly.
But you need to temporary disable your backend cache system and clear all the cache before you do any changes, because what you did from backend, it will not affect on the frontend, because it only load the cache HTML content only.