> For the complete documentation index, see [llms.txt](https://da-home-studio.gitbook.io/elementary-os-user-handbook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://da-home-studio.gitbook.io/elementary-os-user-handbook/troubleshooting/common-issues/double-icons-in-plank.md).

# Double Icons in Plank

When launching a Flatpak app, you see two icons of this app in the [Dock](/elementary-os-user-handbook/overview/desktop-tour/dock.md).

<figure><img src="/files/kIROWyPgv0C81M1iB4hI" alt=""><figcaption><p>Example of the Double Transmission Icon</p></figcaption></figure>

This is a [known issue](https://github.com/elementary/dock/issues/64) related to the Flatpak and Plank interaction. If it still persists in your system, there is a solution.

What you need is to edit the `.desktop` file of the target app by adding the `StartupWMClass=<VALUE>` string.

Let's take the Transmission app as an example in the following guide.

1. Find out the `<VALUE>` you need to add to `StartupWMClass=`
   * Launch the app which shows the icon duplicate.
   * Open the Terminal and run: `xprop WM_CLASS`. Your mouse cursor must turn into a cross.
   * Hover the cursor over your app window, and click. In the Terminal, you will see the `<VALUE>` you need to add.

<figure><img src="/files/lKiGa8ZO7Q4Cxgs2kVAl" alt=""><figcaption><p>Value found in the Terminal</p></figcaption></figure>

2. Find and then open in the text editor the `.desktop` file of the app.\
   You can search for the desktop file of your app in the same direction where the Transmission desktop file in the example is.

```
/home/<USER_NAME>/.local/share/flatpak/app/com.transmissionbt.Transmission/current/3d0fb3864db64add64e036679cccf94bd31d38ddcdd5b22ea263ad742b9ff458/export/share/applications/com.transmissionbt.Transmission.desktop
```

3. In the end of the \[Desktop Entry] section, insert `StartupWMClass=transmission-gtk` string where you will have your app value instead of `transmission-gtk`.

<figure><img src="/files/MgYNnKmu4f3oAGbHwzDY" alt=""><figcaption><p>Added StartupWMClass to the .desktop file (example)</p></figcaption></figure>

4. Save changes and reboot.
5. Launch the app. There must be no more icon duplicates in the Dock.

{% hint style="warning" %}
After the app version is updated, an icon duplicate may re-appear in the Dock.

In this case, you need to repeat the procedure above and add `StartupWMClass=<VALUE>` to the app `.desktop` file again.
{% endhint %}