- Create a new blank C++ project in 4.12.5
- Open the project and “Reset Layout” in the editor
- Go to Window → Developer Tools → Modules
- Drag the floating window somewhere into your editor layout for example as a pinned tab next to “Modes”
- Restart the editor
The modules tab will be there but the contents of it just show the text “unrecognized tab”. Closing and reopening the tab will load it properly.
This only works with C++ projects since this window is not visible in the menu on a normal project. My guess is this is also the reason it will not load by default when the editor first starts.
This is mildly annoying since I use the modules window for compiling and hot-reloading C++ plugins, so I have to do this open + close dance many times a day.