Customizing top bar app icons in gnome

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Hi Seon,
You are looking for the .desktop files, which are located in

  1. Most apps: /usr/share/applications/ or /usr/local/share/applications
  2. Some apps: ~/.local/share/applications/
  3. Installed by Snap apps: /var/lib/snapd/desktop/applications/
  4. Installed by Flatpak apps: /var/lib/flatpak/exports/share/applications/