Hi JeanB,
You are correct that the Manual style will over-ride whatever is Automatically assigned from the Filter generation.
If the number of vendors is too large to do this by editing manually, then the easiest way is to use the export and import process to update vendors. All you have to do is Export all vendors to either an Excel or CSV file, and only the Vendor code field, nothing else. Then create an Import Vendors template using this exported file that only Overwrites existing vendors, has just the Vendor code field to import, and a Default Field for the Manual style, set to blank.
Running this import will change all vendors to have a blank value for the Manual Style, meaning all Automatic Styles will be used for the vendor list and finder grids.
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Regards,
Softrak Tech Support