Microsoft is completely renewing the file sharing view of OneDrive for Business

The renewed view provides an extensive list of all the people who have gained access to your files. You will be able to search for an individual or a group and manage their access with even more control. You can also drill down into the group or link information for more details.

The roll-out of the new view will start now and is expected to be done by late June. Some users may see this feature before others.

Read Microsoft's own instructions about the upcoming update: Managing access in OneDrive for business - Microsoft Support