'Select All' option in a slicer is not intuitive when values are unselected

[shinym201290]

Case 1

When no selections are made - All values are displayed

Case 2

When ’Select All’ option has been selected - All values are displayed

Case 3

When each category is individually unselected. The ’Select All’ appears to highlighted with a square 

Case 4

Even when one category has been selected. The ‘Select All’ appears to be highlighted like Case 3

Case 3 and 4 create confusion to the end users if the values have been selected or not.
Is there a better way to display "Select All" to differentiate when values have selected and not selected ?

[v-yetao1-msft]

Hi  @shinym201290 

When you select Select all, you'll notice that all the options are preceded by √ marks. When you remove one of the following items, you will notice that the sign in front of select all is no longer √ . 

As explained in the official documentation: Under Selection, turn Show "Select all" option to On to add a Select all item to the slicer. With it, you can select or deselect all items as once. When all items are selected, selecting one item deselects it, allowing an is-not type of filter.

You can share this difference with your users, and if you feel it's still unacceptable, you can vote the idea and comment there to improve this feature. It is a place for customers provide feedback about Microsoft Office products . What’s more, if a feedback is high voted there by other customers, it will be promising that Microsoft Product Team will take it into consideration when designing the next version in the future.

Best Regards,
Community Support Team _ Ailsa Tao