Click Copy View to create a copy of the view

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Once you've finished copying, the "Copy of 'All Website Data'" will be displayed.
Click on "Filter" in the bottom section.

Click "Filter"

Then click Add Filter.

Click "Add filter"

If you set the filter type to "Custom Settings" and the filter field to "Device vp facility managers mailing lead Category", you will be able to select "Mobile", "Tablet", and "PC" as categories.

There are also various ways to apply filters, such as "Exclude," "Match," and "Uppercase," so try setting it to suit your site. The most common are "Match" and "Exclude."