Adobe has released a new patch update 23.6 recently and it has introduced a major problem. Now it's impossible to change the font for items once you edit their text in the edit tab. We're working hard on an update to the plugin that would address this new problem.
In the meantime you can use below workaround.
If you would like to keep latest version of After Effects here is our little tutorial how to change fonts.
Bear in mind that when creating a new project you can change font first via properties tab. Changing to desired text afterwards works just as before.
You can also downgrade to previous patch version of After Effects 23.5. Here is how:
1. Open Creative Cloud Application and click "All Apps". Then Navigate to "Other versions" next to After Effects.
2. Install After Effects (23.5)