You have a gamelist.xml already filled in, but they are missing some media that you did not retrieve / scrape. It is possible to filter the games which do not have certain media.
2 methods are possible:
If your games list is already filled with media and you want to search for missing media, you should:
Check the box of the missing media (s) you want to search
click on without
click on Or
Then click on Filter
If media is missing for a game, the game will be displayed in the database
You can do it manually by creating a query that will apply a filter on your database
Example: You want to search for games without Boxart or without manual.
You will have to enter your request in the Query combobox. The request will look like this:
boxart_rom is null or manual_rom is null
Then click on the Filter button
You can reset the filter by clicking the No filter button