If you want to change settings, you open the settings dialog (Tools > Settings), and it as tabs like "General", "Fonts and colors" etc.
Most people were a lot less computer literate back then, but they were able to use most applications with little help. If they really needed help, the help system was built into the application.
The goal back then was to have the user get the work done as efficiently as possible, in effect, minimizing the time the user pends on the application. Modern UX doctrine aims for the opposite goal -- to keep people "engaged" as much as possible. This might be okay for consumer apps, but maddeningly, the same doctrine gets applied to enterprise applications as well. I've literally heard non-techie employees of a Fortune 100 company ask for their legacy green screen terminals back because the new, flashy SPA was slowing them down.