Hi,
"Company Name" is not the key used by EPESI. Each recordset has a primary key called ID. Therefore if you have two companies with the same name they will still be different, because company "ABC Company" with ID=1 is different than "ABC Company" with ID=234.
The "i" (info) icon will show you this ID - and we put it there for a reason - to distinguish 2 records with the same company name (or task name, or first and last name for contacts, etc.)
See this example:
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You can not rename "Company Name" field or use it for any other purpose, because almost every module in EPESI uses it and it is hard coded.
I can not really grasp the logic of your solution or what is that you are trying to accomplish. If you really need a number to identify your customer/company then just add new field (Admin->Record Browser->Companies) and add text field which will take some identifier. Over there you can also turn on and off which fields are visible in browse mode (I guess this is what you had in mind referring to "preview").
Better yet add Autonumber field which will produce a result like:
#00000123 Company A
#00000124 Company B
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and these values are unique. In reality they are simply masked record ID, so for example:
Company A, ID=123 will produce: #00000123
Then just turn it on in "table view" and you will see both. However in other modules the select or multiselect will still show only "Company Name". It is possible to display in the format: "#00000123 Company A" instead of just "Company A" but this would require some code changes.
I still don't get it why someone would try to remember numbers instead of names. It is easier to remember "Company XYZ" than 754283, isn't it?