If you've selected a number of filters in the tool and you want to save the result and come back to that view later, you can use 'Bookmarks'.
Select the bookmark drop-down box found at the top of the screen and select 'Add Bookmark'. You will then be asked to name the bookmark.
You can then return to that bookmark at any point and your filters will be restored. You can set multiple bookmarks and organise them through the 'Bookmarks' dropdown.
Note: major changes to the PD tool may lead to the resetting of bookmarks, so do not rely on them.