Unable to edit lookup Data model after installed application from file

I installed an application(Freedom UI) from the other instance. Prior to installation, I ensured that the data binding was correctly set up to ensure the lookup is connected to the export application.



After installing the application on the new instance, the lookups are functioning properly. However, I am unable to make any changes, such as adding a color column or other columns in the lookups (Data model objects).



Please assist in this matter.