If you have installed XFCE desktop environment on your Debian 12 system, and you are wondering whether you can change the default icons themes on your Desktop, yes you can, you can easily change the default icons from your system settings, without having to download any additional tool.
By default Debian 12 XFCE doesn't have a lot of options when it comes to themes and icons, so in order to change them, the only option is to download them manually and install on your machine.
In this tutorial, you will learn how to change default icon theme on Debian 12 XFCE.
Step 1 - Download Icon theme
There are so many icon themes that you can download and install it on your machine. However, in this tutorial, we are going to install papirus
icons.
Papirus icons can be easily installed on Debian 12 as they are available on Debian 12 respositories, which means you don't need to do any other manual action except running the command to download papirus.
To install Papirus icons, run the command below
sudo apt install papirus-icon-theme

Step 2 - Use new Icon theme
Once you have downloaded papirus icons on your system, you can proceed to change the default icons with papirus
To do this, first open Applications Menu

Next, go to "Settings" and choose "Settings Manager"

Once you are in the Settings Manager window, you need to go to "Appearance"

Now in Appearance window, click to "Icon" tab

Papirus icons come in five variants, so you will see different Papirus styles on icons, click on the style that you like, and that icon style should be applied to the whole system.

Conclusion
In this tutorial, you learned how to change the default icons on Debian 12. We used papirus icon theme for this tutorial. However, you can use any icon theme you like.