What I did: updated via AppStore to 19.0 (302)
What happened: start is ok with “on the agenda” selected left. But every click, where the search / filtering will be used the app hangs
What I expected: a working app 
Things that might be helpful to know (Agenda version, OS and model, etc):
Agenda 19.0 (302)
Mac OSX 14.5 (23F79)
It is working now, after deactivating calendar access in system settings and reactivate it.
Ah glad you managed to find out what it was!
This method doesn’t work for me. I didn’t even have the Calendar access activated. Activating, deactivating, and re-activating the Calendar access didn’t help.
The search started to hang since the introduction of the new search feature. This issue happens only on my work computer, where the macOS is modified by my job for security. Maybe my job put some restrictions on Spotlight and it is causing this issue, but I am not sure. The Agenda search works fine on my personal computer.