A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
You can use the CountA and SubTotal functions in Conditional Format because COUNTA counts all cells in the range and SUBTOTAL only counts the visible cells so when they are not equal, Filtering has been applied.
Select the entire AutoFilter range (without any filters applied)
Select Conditional Format -> New Rule
Select "Use a formula to determine which cells to format" and enter the following formula where column A is one of the filtered columns.
=COUNTA($A:$A)<>SUBTOTAL(3,$A:$A)
Click the Format button and set the required format.