Max Sell Power (minimum 500)
This setting has changed recently - it used to have a minimium of 10w. Now it is 500w.
I only wish to export my power to home (essential and non-essential), not to the grid.
Is there a way I can achieve this?
Attached is my current System Mode Settings from the web interface

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Re-reading your original question I see you don't understand the system.
Export only refers to exporting to the grid.
Are you perhaps referring to the inverter feeding the non-essential load, ie. the items connected between the CT and the inverter Grid connections?
In this case you need to set the "Work Mode" under "System Mode" to "Limited to Home".
This post will help in your understanding.
https://stepupdotenergy.wordpress.com/2023/12/27/sunsynk-5-and-8-kva-inverter-operation/