Other members have had the same issues
@Chris100. Some have found that programmes like Antique Roadshow were acceptable. Others natural history programmes were enjoyed but then sometimes the PWD was upset is a cute animal was killed by a big cat.
If I remember correctly one member on here recommended Andre Rieu music programmes because of the music, movement and bright colours.
It is partly trial and error. Shorter programmes are best as attention spans lessen as the dementia progresses.