Also, if you see the issue with any plugin/theme/WordPress update.
Could you please try to resolve your issue by deactivating all third-party plugins as well as the default theme to check for any possible conflicts with any of the plugins or themes?
- What if you downgrade the theme/plugin/WordPress do you see it working as expected as before?
I'm not sure how you build your view and you must have added custom JS code and I can see Javascript error on browser's console and now I'm not able to see the menu you mentioned "Impuls-Art".
What if you try to downgrade the Toolset Blocks plugin to previous version 1.6.16 - do you see it working as expected?