If a column is hidden at the data source level, can it still be accessed at the dashboard designer level?

If a column is hidden at the data source level, then it will not be available for use anywhere in the dashboard designer level, including expressions, filters, sorting, etc.

As illustrated in the following data source, the ‘Destination URL’ has been hidden. Once this data source is saved, you will not be able to use this field unless it is re-enabled.

Therefore, the field is not visible at this location.

Additional references

• How do I sort the measure field based on hidden column in a Grid widget?