Check if Preferences / Folders / Folder Behaviour / Enable Folder Content Type detection for... is turned on, and enabled for the type of drive.
If you're opening the Default Lister, make sure Preferences / Launching Opus / Default Lister / Ignore folder format of Default Lister is turned on.
Or, if you're opening a layout, select the layout under Preferences / Layouts and Styles / Layouts and make sure Ignore folder formats saved within this layout is on, otherwise the saved format may override the content type detection when the lister first opens.
If you're still stuck, please start a separate thread for that question, and post the relevant details into that thread so it is self contained.
There are at least three separate questions being discussed, interwoven, in this thread and it's already like trying to trace through spaghetti, and (especially given the subject) unlikely to be found by anyone else with the same problem in future.