How to grey out future dates in date slicer

[Julia2022a]

Good morning,

Can you please teach me how to grey out future dates in the date slicer? I don't want people able to choose a future date in the date slicer. My data does not contain any dates after today but the when I click the date calendar slicer, it still let me choose future dates. Can someone help me? 

I am using the December 2020 version. Due to the company restriction, I can only use this version. 

Thank you very much for your help!

Julia 

This is what my data look like:

[PaulDBrown]

You can try adding the following measure as a filter in the Date table filter pane and set the value to = 1:

Filter dates = COUNTROWS (FILTER(Date Table, Date Table[Date] <= TODAY()))

[Julia2022a]

Thank you @PaulDBrown. I tried it but still not working 😞 I can still choose future dates. Can you please let me know if I did anythign wrong?