All photos displayed in 2D view(s) to be highlighted in left-hand 1Ds and 2Ds views, both in the Images list and in Component list(s); any activated photo to be doubly highlighted!
that is, a purpose and appearance of highlight that’s additional to the present white highlight in 1Ds and the corresponding coloured frame in 2Ds.
Moving through photos by < > arrows, the highlight to move too.
Without great memorisation, it’s easy to get lost when comparing photos or selecting best ones for Control Points. This would greatly help keeping track.