This tutorial video teaches how to export data in your desired file format, for single and multiple projects.
If you write a word into the „Keyword Search“ without choosing a filter first, the system looks mostly through the text fields. Therefore the results may be not as accurate.
You tried to export more than 150 projects or did not remove the check before the column „Description“. This is a very long text and not meant for excel exports.
If you have bought the add-on you can see the button “Export Search Results” in the row underneath the number of search results. Please keep in mind that only around 150 projects can be exported per list.