You can move furniture in your room, add or remove new moderators and your room will be still in featured rooms. Every time you want to make a change on your room, you will get a warning that says > Modifying this room can remove it from featured ones. Don't mind this warning and keep making your changes. Only way your room will be removed from featured ones is when you either want to change > Description, room picture, and room name. Additionally, the warning you get when trying to change the 3 things I stated, will be different and it will say this room will be removed from featured ones in a big window with large buttons in it. So make changes in your room but still becareful.
One other thing I don't like about adding a new moderator to a room is when you put their name and click save changes, then when you open the room edit section to see if it worked. Their name will not be there and you will keep trying and trying. I did not know the reason to that but 1st reason is moderator needs to be your friend, and the 2nd reason is when you add the room moderator, you need to reopen the "Chat Rooms" panel all over and it will show their name on moderator list.
Heralds
