@Anonymous
Put code like this in the Items property of drpdown_FilterColumn
["Column1","Column2","Column3"]
I would suggest some code like this in the Items property of your gallery.
Filter(
your_datasource_name,
(drpdwn_FilterColumn.Selected.Value="Column1" And StartsWith(Column1, TextInput1.Text))
Or (drpdwn_FilterColumn.Selected.Value="Column2" And StartsWith(Column2, TextInput1.Text))
Or (drpdwn_FilterColumn.Selected.Value="Column3" And StartsWith(Column3, TextInput1.Text))
)
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