I had to change my rooms.So my Sub, Playbar and two Play1 have been reset to factory defaults so I could do it properly.But when I connect them the process takes a very long time and I get the message: The product has been added, but may not be visible. Please unplug and fix it in system settings.But it doesn't work and a new group (Living Room) is just created. Question:1. Can I delete these rooms (Living Room)2. Can I delete speakers and then add them again, as a new speaker
It’s usually easier to just rename a room than to reset speakers etc.
A room with no associated speakers will drop off the app after a day or two.
With your unnecessary factory reset you made a mess for yourself.
You now need to follow the steps for installing a new Sonos system if you reset all, or the add new speakers steps if you didn't.
Don't worry about room names until you have all your speakers added back.
Set up pairs and TV sets as needed.
Last step rename the rooms as you like.
Avoid factory resets, they rarely fix anything,the usually make them worse while leaving you with a lot of extra work.
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