LRC used to show the file location in Library

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You can see the folder containing a photo by right-clicking it and doing Go To Folder In Library, which will select the folder in the Folders panel in the left column of Library.

You can also see the folder by selecting the photo and looking in the Metadata panel in the right column of Library.

You can put the folder or file name of a photo above or below the thumbnail in Library grid view by doing View > View Options, setting Show Grid Extras to Compact Cell Extras or Expanded Cell Extras, and choosing Folder and/or File Name in the corresponding dropdowns:

If those options aren't what you're thinking of, we'll need more detail.

Some setting probably got changed, either during an upgrade, or during a reset, or by operator oops.

Perhaps see: https://helpx.adobe.com/lightroom-classic/help/setting-library-view-options.html