ZMI works for me. I suspect that you are not using the very latest version of Calibre 5.99.8 and the ZMI Qt6/Py3 version for it at:
https://www.mobileread.com/forums/sh...8&postcount=20
Calibre 6.0.0 will likely go live soon, so update to 5.99.8 (6.0.0) now.
Posting ZMI issues without being on the very latest version of both ZMI and Calibre is pointless.
DaltonST