On occasion we have a need to change the data sources for the layers in our MXD files. Some MXDs have quite a few layers, so it would be a pain to go through each one in ArcMap and change them. This might happen to you when your source data is moved to let’s say a new enterprise geodatabase and now you have to update your MXD files.
If you have not done so before, try the Set Data Source(s) tool in ArcCatalog. Just navigate to where your MXD file is, then right click on it and select the Set Data Source(s) option:

The tool will open showing you the data frames and all the layers including their current data sources.
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