Not clear as to why this isn’t working exactly.
It sounds like you want to show tickets that DO NOT have specific tags, then your overview is setup with the Tags you want. It’s a bit confusing.
If you are only using one condition, you don’t need expert mode. Change the Condition for shown tickets to “Tags” → “contains one” → “The tags you care about”. This should show all the tickets with those tags.
If you want the opposite, change the “contains one” to “contains one not” and list the tags you don’t want to see.
If this isn’t working, then perhaps sharing a screenshot of your overview configuration along with a clearer description of what you are looking to do.