It is a very common and automatically created expression (AppSheet automatically creates a virtual column of type List linked to a column defined as type Ref of another table). It shouldn't take that long.
If you have created a physical column and you have put in its formula: REF_ROWS("Selected Items", "User")
I can't understand what the objective is.
The other thing that occurs to me is that in the table, although it apparently only has 2 records, in some row much further down there is some data and AppSheet thinks it has a lot of records to analyze.
My advice is that you physically delete the rows starting from the last one that has data.
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