Hi @Wah22 , I believed you are using modern combo box with multiple selection turned on. If you do not want multiple section then please make this property SelectMultiple to false.
And for the value, does Status is table name? Because this is how the Choices function will work
Choices(Accounts.Status)
In above example, i have status column in data verse table Accounts. If I use this code on Items property then it work like this:

Syntax
Choices( column-reference [, text-filter ] )
- column-reference - Required. A lookup column of a data source. Don't enclose the column name in double quotes. The reference must be directly to the column of the data source and not pass through a function or a control.
- text-filter - Optional. Filters the list of choices by only returning choices that start with the text specified in text-filter. If an empty string is specified, all choices will be returned.
Reference: https://learn.microsoft.com/en-us/power-platform/power-fx/reference/function-choices
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I hope this helps.
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Thanks,
ANB