Getting Started
4. Launching KeePassXC
Now, to Start KeePassXC UI
From Command Line execute:flatpak run org.keepassxc.KeePassXC
Or Use the Desktop Launcher:
Here above for a GNOME Desktop.
5. Getting-Started Guide
Getting-Started with KeePassXC on GNU/Linux

So Now I’m truly Happy if My Guide could Help you to Quick-Start with KeePassXC on Red Hat Linux 9!