I also could not find the option to enable Clipboard Sync. I contacted TV support, and they told me IT HAS BEEN REMOVED FROM V13 ONWARDS.
This is a total disaster,.I have 400 devices spread around the world, and will shortly upgrade them to Ubuntu20. This means we are forced to go to TV15, but it has no Clipboard Sync! This will add 15 minutes per head per day to our work, or AUD$500 per week across a number of staff.
PLEASE BRING BACK CLIPBOARD SYNC in the latest TV for Linux.