@MiniMe_83 - as I understand it, you want to filter a Gallery based on either a combo box selection or search text?
The below example assumes your ComboBox is referencing a Choice column.
Filter(
YOUR_DATA,
CountRows(YOUR_COMBO_BOX.SelectedItems) = 0 || YOUR_CHOICE_COLUMN.Value = YOUR_COMBO_BOX.Selected.Value,
IsBlank(YOUR_TEXT_INPUT.Text) || StartsWith( COLUMN_TO_SEARCH, YOUR_TEXT_INPUT.Text )
)
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