Pretty significant bug (caused by macOS Sonoma 14.1)…

Blackmagic Forum • View topic – Resolve Studio 18.6.2 Fairlight Issue in macOS Sonoma 14.1:

This has been resolved for me in macOS Sonoma 14.1.1 released today [November 7].

When using the Mixer panel in Fairlight, the channel effects pop-ups will not close. I can confirm that MacOS 14.1.1 fixes this issue.