Hello,
Works for me: Windows11 Shotcut version 24.02.20
Difficult to answer without knowing your Shotcut version. Have you updated recently?
If you’re working with version 22.01.28, when you detach the audio, the two files are grouped together.
To ungroup them, proceed as follows:
1 detach audio
2 right-click and : Group/Degroup
3 click on Track Head or Output to deselect the tracks.
4 You can now select the audio track. The properties tab is visible.
This has been modified in previous version 22.02.20 :
Stop automatically grouping audio/video clips when Detach Audio.
If you’ve already downloaded this version, it’s may be related to this:
in the topic: BETA version 24.02 now available to test
Fixed in nightly version #1355 for Windows, #1322 for Linux, #1157 for MacOS