In the OF4 perspective list I can’t see a way to differentiate the built-in perspectives from my own custom ones. In the OF3 Show Perspectives window they were bolded. Am I missing something?
In my Omnifocus setup, it’s the icons I use for custom perspectives that let me clearly distinguish whether they’re my psrspectives or native ones. Here you can choose from masses of icons the ones that fit your perspectives. They are then simply different from the system-internal perspectives. https://omnifocusicons.josh-hughes.com
I really like that color-coding!