To switch from Gnome to KDE Plasma on Arch Linux, you can follow these steps:

1. Install the KDE Plasma desktop environment by running the following command in the terminal:
```bash
sudo pacman -S plasma
```

2. Install the SDDM display manager, which is used by KDE Plasma, by running the following command:
```bash
sudo pacman -S sddm
```

3. Disable the GDM display manager, which is used by Gnome, by running the following command:
```bash
sudo systemctl disable gdm
```

4. Enable the SDDM display manager by running the following command:
```bash
sudo systemctl enable sddm
```

5. Reboot your computer.
6. When you log in, select "Plasma" from the session list in the login screen.

Once you have completed these steps, you should be able to use the KDE Plasma desktop environment on your Arch Linux system.
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