On your navigation page, go to 'Edit Filter' within the General Tab you can select 'Custom value list' and untick 'Include all values when empty'. This works as a reset because unless you type in values, it will remain empty.
Let me know if this helps.
Dear Manu ,
Please find the below approach.
1- Create a separate sheet as "Reset".
2- Drag and drop the sheet into the dashboard.
3- Create an action as below:
a: Keep source sheet as "Reset" sheet
b: Keep destination sheet as all the sheets which needs to be shown on the dashboard.
c: Under Target Filters select selected fields and add the filter coulmns as both source and destination field.
4- Save the action.
or follow the below approach which is mentioned in the below link
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