Just getting started with HA and loving it, but one of the things I am noticing is that while I can add comments in my yaml config files to assist in readability and reference where various things come from or interact with, any attempt to enter comments into the UI simply get removed on saving.
It would make understanding the UI config much easier if we could add comment lines to describe what things are doing or even just to separate cards and views for readability.
Switch to yaml mode for lovelace and you can.
And not only can you add comments in yaml mode, you can also split up your lovelace config files using !include statements just as you would in your regular config.