Global filters are always available whenever we plot charts in a dashboard. Global filters are applied to all the charts in a given dashboard.
This feature is especially useful when more than one dataset is used in the dashboard, and there are common columns across the datasets on which filters need to be applied.
To apply global filters, follow the steps given below.

1. Create the number of charts as required. Refer to Creating Charts using Widgets.
   For example, here, we have created three charts on the dashboard canvas. All the charts contain the dimension 'Category' in them. The three categories are Technology, Office Supplies and Furniture.
2. In the top left corner of the dashboard canvas, click Global Filter.
   
   
   
   
3. From the list of data fields, click the data field you want to use as a filter.
   Here we are filtering by Category.
   
   
   
   The Category field is added.
4. Click the added Category field and select the check boxes corresponding to the fields you want to filter.
5. Click Apply.
   
   
   
   For example, for the charts above, we have selected only Office Supplies and Furniture.
   The filter is globally applied to all three charts, and the charts are filtered according to the selected fields.