Can you not edit table length parameter if it is set on instance parameter? I put it at instance and the measurement is greyed out but I did another Length set to be Type and it can.. I would appreciate an explanation, thank you so much!
Depends how the family is created. Consider uploading it so we can have a look
If in the family the instance parameter has a formula then it can not be changed because it is controlled by that formula
Louis
Please mention Revit version, especially when uploading Revit files.
By the sound of it, you are looking at an in-built template parameter. In-built parameters cannot be modified or removed. The solution would be to use another Template, or simply not use the in-built to drive any dimensions. Instead, create your own length parameter (w/ different name), and label your dimension with that new parameter.
Example of Built-In Parameter "Height" in Window Template:
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