The FilterEditor is already the full width of the grid, as it provides field-by-field filtering. You just have the other fields configured to not be searchable for some reason.
If you don’t want field-by-field search, and you want to search all fields of the grid from a single input, you should just create a separate DynamicForm for that single input, make it as wide as the grid, and submit criteria from it to the grid’s filterData() method.
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