Signal comes with a dedicated desktop; however, it's Linux
incarnation is
only available for Debian-distributions, no rpm package as yet. Are there
any plans for one?
If you run Chromium[0], you can then add a Signal as a Chromium App and
you can then have the Signal desktop on your system. That's how I have
on my F27 GNOME system.
Harish
[0]
https://fedoramagazine.org/install-chromium-fedora/