How to set default values dynamically for slicer?

Hi , kgandhi2001 

According to your description, you want to "set default values dynamically for slicer".

Here are teh steps you can refer to :
(1)For the slicer that comes with Power BI, we can not get it. But we can get the three point in the "Visualizations", and we click the "Get more visual":

Then we find the "Preselected Slicer" and add the visual to our Power Bi Desktop.

First , we need to create a table with one column , and the value is True and False, like this:

Second , we can create a measure to define which the date we need to default preselected. If we need to default preselect then we return True else return False.

Flag = var _date =SELECTEDVALUE('Date'[Date])
var _today = TODAY()
var _last_5_days = _today -4
return
IF(_date>= _last_5_days , TRUE(),FALSE())

 Then we can default dynamic preslect the last three months in the slicer visual , and when we select other date, we just need to click the red reset button in the upper right corner to recover the defalt selections.

You can also refer to this:
Solved: How to set last 2 months as default filter in a po... - Microsoft Power BI Community

 

Thank you for your time and sharing, and thank you for your support and understanding of PowerBI! 

 

Best Regards,

Aniya Zhang

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