EXCEL: Remove blanks from Dropdown List & make Dropdown List inactive if no options are returned? - excel-formula

I use a Unique Filter formula to obtain a list. I do not want any blanks in my Dropdown List at all.
Problem,
1: How can I remove the blanks?
2: If the list returns no options can I make the Dropdown List inactive?
3: How can I have the first or all dropdown list options displayed in the cell, before clicking on it with a mouse?
I tried selecting REMOVE BLANKS in Data Validation but the blanks still show up.
IMAGE[1]: https://i.stack.imgur.com/8JbGQ.png

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How to remove blank spaces from drop downs in Excel? Ignore Blank checkbox doesn't work

I am creating drop-downs using list data validation in Excel.
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The number of blank spaces = Total number of rows in longest column - Number of values in selected column for drop-down
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Selecting Data validation
Blank Spaces showing in drop-down
Unique Function

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enter image description here
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]1
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