In Ubuntu 18.04 the topbar of the Terminal window contains the following pull-down menus:
File - Edit - View - Search - Terminal - Help
In 20.04 they were missing. I DID manage to turn them on, by right-clicking inside the Terminal window. But I think it would have been more logical if you could just turn them on in Preferences.
The worst thing is that I have to turn on the menu bar every time I enter the terminal... That seems kind of primitive to me.
I don't know WHY it's impossible to turn them on from Preferences (I hate that too!), however it is possible to turn them on permanently via dconf-editor (you need to install it first). From top level, go to org/gnome/terminal/legacy and set "headerbar" to false. (BTW. After you set "headerbar" to false, the option to turn on/off menu bar does appear in Preferences)