Hi ,
I'm Mukesh and I will be happy to help you out with your question.
This is my design that you cannot see the filter that is hidden. You can't remove filters from individual columns. Filters are either on for an entire range, or off. If you don't want someone to filter a particular column, you can consider hiding it.
If you want to completely remove filters, go to the Data tab and click the Filter button, or use the keyboard shortcut Alt+D+F+F.
I hope this information helps. If you have any questions please let me know and I will be glad to help you out.
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Best regards
Mukesh