On/off the radar screen
Definition 1 of 2
Pro Tip 1/3Visibility Matters
The phrase often implies that something should be visible or known to everyone involved. 
After the merger, our project is finally on the radar screen.
Pro Tip 2/3Change Over Time
Indicates that something's relevance or recognition can change, usually due to new developments. 
Once the leading brand, they're now off the radar screen.
Pro Tip 3/3Attention Shift
Used to express a shift in collective attention or focus within a group or society. 
Eco-friendly practices have come on the radar screen lately.