[Issue] xfce4-settings-manager under hyprland

Hi again, I found a solution that works for me. So I post here to help any other user facing the same issue. The problem I encountered happened because xfce4-settings-manager is trying to run under Wayland, but it is built to work with X11. The error suggests a compatibility issue between GTK, X11, and Wayland. I use hyprland.
So the solution that works for me was to run xfce4-settings-manager using XWayland, which is a compatibility layer for running X11 apps in Wayland, with:

GDK_BACKEND=x11 xfce4-settings-manager
This command forces xfce4-settings-manager to use Xwayland (terminal).

-To run xfce4-settings-manager under XWayland without needing to use the terminal each time,

1.Create a wrapper script:
sudo nano /usr/local/bin/xfce4-settings-manager-wrapper (global)
(or local to: ~/.local/bin)
(make sure the directory is in your $PATH).

-Add the following lines to the script:
#!/bin/bash
GDK_BACKEND=x11 xfce4-settings-manager

-Make the script executable:
sudo chmod +x /usr/local/bin/xfce4-settings-manager-wrapper

2.Modify the .desktop File to Use the Wrapper Script
sudo nano /usr/share/applications/xfce4-settings-manager.desktop

-Change the Exec line to point to your wrapper script:
Exec=/usr/local/bin/xfce4-settings-manager-wrapper

3.run the xfce4-settings-manager-wrapper from hyprland menu

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Then, another problem I had, was that I couldn’t run the firewall configuration (Gufw) from inside xfce4-settings-manager-wrapper. With the errors:

(gufw.py:6742): Gdk-CRITICAL **: 12:11:52.759: gdk_keymap_get_for_display: assertion 'GDK_IS_DISPLAY (display)' failed .
(gufw.py:6742): Gdk-CRITICAL **: 12:11:52.759: gdk_keymap_get_modifier_mask: assertion 'GDK_IS_KEYMAP (keymap)' failed .
(gufw.py:6742): Gtk-CRITICAL **: 12:11:52.760: _gtk_style_provider_private_get_settings: assertion 'GTK_IS_STYLE_PROVIDER_PRIVATE (provider)' failed /usr/bin/gufw-pkexec: line 2: 6742 Segmentation fault (core dumped) python3 /usr/lib/python3.12/site-packages/gufw/gufw.py "$@"

So, what I found is that, gufw crashing due to Gdk and Gtk errors, is likely due to incompatibility with Wayland. Gufw has stability issues under Wayland and generally functions better under X11.
The solution I found, is to run gufw with xhost to grant temporary display access.

1.Create a Wrapper Script:
sudo nano /usr/local/bin/gufw-wrapper

2.Add the following lines to the script:
#!/bin/bash
# Grant root access to display
xhost +SI:localuser:root
# Run Gufw with X11 backend using sudo
GDK_BACKEND=x11 sudo gufw
# Revoke display access for root after closing Gufw
xhost -SI:localuser:root

3.Make the script executable:
sudo chmod +x /usr/local/bin/gufw-wrapper

-if you want to run it from menu edit:
sudo nano /usr/share/applications/gufw.desktop
with:
Exec=/usr/local/bin/gufw-wrapper

-I prefer to run ti from the terminal, so I can see messages. The output I take is:
localuser:root being added to access control list
localuser:root being removed from access control list