I'm new to Jetbrains Rider (an old VS user). I'm using Rider EAP It used to show usages on top of variables but I think I messed up something and it stopped showing anymore. please check the image below, this is how the usages/references used to show up:
This is my Rider EAP version:
So found the answer and the reason it wasn't showing is that 'Code Vision' was disabled somehow.
If you come across this issue, please go to Settings > Editor > Code Vision and check the following checkboxes: