Find in Files: Idea highlights only first occurrence per line

Navigate to a file to highlight occurrences: https://www.jetbrains.com/help/idea/find-highlight-usages.html#usages_in_file.

Unfortunately in my case I have 20+ files in which I need to view occurrences. If I could see all occurrences on one screen, it would save me a lot of time.

Use Open in Find Window button to see all the occurrences in all the files.