Settings editor

The three checkboxes indicate that there are different settings for that building: from left to right they are mod settings (settings applied by a specific mod); author settings (settings included with workshop assets); and local settings (yours). Naturally, you can only edit local settings.

The mod applies settings in order: local first, if there's not local settings then it'll apply author settings, and only if there aren't any other settings will it apply mod settings.

You can create local settings for any asset, regardless of whether or not author (or mod) settings exist.

For any changes to take effect, you'll need to save the mod settings, save your game, quit to desktop, and reload your save. This includes adding local settings - those buildings won't show up in the ploppable menu until you restart the game.