Is it just me - or is there no more possibility to filter device events (new user interface)? 
In what way? Do you mean in the logs or in the Device page?
In the Device page you can just click the Events tab at the top of the page. In the Logs pages you can just use the 'Filter by app/device' at the top of the screen or click the links to a specific device as before.
Yeah I noticed this during beta and posted it but totally forgot to circle back and follow up on it. Looks like my report was missed.
Beta users only -> https://community.hubitat.com/t/2-4-0-133-new-events-tab-is-missing-search/146924
Yes, the search box is back: 
Thanx a lot!