One problem that can take up a lot of time if you are working in a large project with a lot of tables in the DBML database model file when using Linq to SQL in Visual Studio is finding the table in the diagram. Control+F doesn’t work, and it can be a real pain to scroll around for ages. However, the following article mentions a very simple solution – just use the dropdown at the top of the properties window! Seems obvious, but I know quite a few people have been complaining about that for months!
Taken from Is there a way to find a table in a DBML file in Visual Studio 2008? – Stack Overflow.