Omarchy OS: Why won’t an app open from the launcher?

Check whether the app is installed and whether its launch command works in a terminal.

If it was removed, reinstall it from Install > Package. If it is installed, run its command from a terminal to see the error. Custom menu entries are defined in ~/.config/omarchy/extensions/omarchy-menu.jsonc, so check the action there if only a custom entry fails.

Source: Omarchy manual.