Where exactly does one enable the "Dark Mode"?
In your Windows Settings you have to enable it first.
There's no dark mode button in qBit v4.6.0, even current latest v5.0.0alpha1 experimental development build doesn't have such button and qBit relies on dependency Qt6 library to get and use more native OS theme automatically and immediately without requiring to restart qBit to see some changes to qBit interface. Otherwise too much unnecessary code to test and maintain if have to bundle extra theme files or to try to use workarounds instead of allowing Qt to be responsible for qBit theme changes.
The customisation panel presents a list of colours and icons for both a "Dark Mode" and a "Light Mode".
You can currently only specify icons and text colors in v4.6.0, even latest v5.0.0alpha1 doesn't allow specifying background color without modifying code or without using any custom theme file.
Do the developers involved with the project read this forum?
Better to use GitHub, although various help is asked and discussions happen more often in reddit, but GitHub is more organized and is a lot better if you really want feature requests, bug issue reports or qBit related Q&A on GitHub Discussion page to be read by developers and contributors.
Many users don't know how or not interested to give enough basic info in GitHub, so I'm not surprised if many prefer using other websites.
It's unfortunately very hard to keep track on unresolved and fixed things elsewhere other than in GitHub, seems as if it's not easy to even add tags or labels elsewhere and development is still done in GitHub, that it's probably too inconvenient to constantly read unorganized things elsewhere.
Forum is good if someone has a new tool, script or guide, then there's a chance it gets pinned on top for new users to notice them, unfortunately less things ever get pinned elsewhere.
This misunderstanding or hope to see somekind Dark Mode button was also recently mentioned in GitHub:
https://github.com/qbittorrent/qBittorrent/issues/19754
So if you don't want to use experimental v5.0.0alpha1 or not interested to create your own fork in GitHub to get qBit v4.6 to use Qt Fusion Style by default, then you can use qBit v4.6.0 and try this:
This is how I got qBit v4.6 Dark Mode in Win11:
1. Enable dark theme in Windows OS settings.
2. Make sure you disable custom theme in qBit.
3. Exit qBittorrent and make sure it's fully closed.
4. Now try running qBit with one of these:
Right-click on your Windows Start Menu icon, then select RUN, then copy and paste the default qBit location with the extra command and press OK:
"C:\Program Files\qBittorrent.exe" -platform windows:darkmode=2
Alternatively, you can modify qBit shortcuts:
Open Start Menu, right-click on the qBit shortcut, select to open its location, now right-click on the shortcut file, right-click on it, click properties, and then change Target field to: "C:\Program Files\qBittorrent\qbittorrent.exe" -platform windows:darkmode=2
Or on desktop, copy your qBit shortcut, rename it as qBit Dark Mode, then right-click on it, select properties, and then change the Target field to: "C:\Program Files\qBittorrent\qbittorrent.exe" -platform windows:darkmode=2