Hi @dave-jorgensen ,
Firstly, please try to refresh the data source from View> Data sources> Refresh.
I just tested with CDS entity and after this the max length would change to the new setting successfully.
Secondly, if this doesn't work, please try to add the CDS entity using CDS connection directly and test again if possible to connect.
Note that you're using the Common Data Service connector.
As I listed in the description of the problem, the issue is with the Dynamics connector to CDS.
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