A helper to find disconnected tiles

[gereleth]

When I play a big puzzle on my phone and it's almost solved I sometimes spend a lot of time just scrolling around looking for that last disconnected piece. Some kind of help to find it would be nice.

[gordonwoodhull]

I play the 10x10 because the beginning is the hard part.

Near the end I find it easy to spot the disconnected 1s but hard to find the open ports on the big component, I guess because they are the same color.