You can filter panes by type using the "filter" icon in the header. Filtering is done on a category level, so by default you can filter Mobile, Tablet, Desktop and Other. If you have your own set of device presets, those categories will be shown instead. If a pane matches the name and dimensions of a device, it will fall under the category.
Click the filter icon to select which categories to show (signified with a checkmark) when the filter is active. To activate the filter, click the "activate filter" button in the drop down. When the filtering is active, the filter icon in the header will be solid. When it's inactive, it will be a grey outline.
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