What do we understand from the word 'visible' or the meaning of this action?
The context is:
Acts 10:40-41 God raised Him up on the third day and granted that He become visible, not to all the people, but to witnesses who were chosen beforehand by God, that is, to us who ate and drank with Him after He arose from the dead. NASB
There's a wide variety of interpretations like; caused him to appear, permitted Him to be seen, gave him to be revealed, be made manifest.
The Emmaus road incident shows another facet that draws our attention to Jesus' audience... rather than Jesus.
Then their 'eyes were opened' and they recognized him. So it wasn't J that was necessarily different - they thought he was another traveller. Mary thought he was the gardener - just another bloke. (Luke 24)
God had 'closed their eyes' to him, until it was the right time for them to 'see' and understand.
Perhaps also address the, 'not to all the people' aspect.