How To Customise Lookup Form

Can someone help me with how to customise the form used to select values after a lookup.

I am using a lookup from one controller (Brokers) to another controller (States) where I select from various States. I am using a custom Grid view in the States controller. All works fine but I want to customise the look of the view.

There are two tabs appearing at the top of the form (circled in red below). How can I hide/delete these?

How can I edit the text highlighted in blue shown below?

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