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I am creating drop-downs using list data validation in Excel.

I am checking the "Ignore Blank" checkbox ON while creating the drop-down. Yet, the blank spaces are not being ignored and it shows in the drop-down.

Also, the number of blank spaces is equal to the number of rows in column A (in given Example). In case of multiple columns,

The number of blank spaces = Total number of rows in longest column - Number of values in selected column for drop-down

Also, usage of UNIQUE function in data validation is showing error.

How do I solve these issues? I am submitting screenshots for reference.

Selecting Data validation

Blank Spaces showing in drop-down

Unique Function