I installed fedora kde earlier today, hated kde, couldn’t uninstall it, so reinstalled with workstation. My hostname was originally computer, but I changed it, but now I still see user@computer ~ whenever I go into a terminal? is this a problem. Gnome terminal also looks weird
Gnome terminal looks weird, or old, because it uses a different UI library to the other Gnome apps.
The new looking ones use GTK4/Libadwaita, wheras Gnome terminal uses GTK3. There is porting work being done, but for the time being you can use another terminal which is Libadwaita such as Blackbox or use this theme which makes GTK3 look like GTK4.
Oh, I’m used to Ubuntu which has a custom theme for terminal
If you’re just referring to the color scheme, you can adjust that to your liking in the preferences section of menu in the top right of Gnome Terminal.