Clear Memory

How do I clear memory from ParaView? I recently removed a file but it did not change the amount of available memory.

System can reclaim memory whenever it wants. Just read another file or two, and memory usage should update.

What kind of files does ParaView account for that take up memory? Only ParaView files, or all the files located in that user drive?

ParaView just ask the system for RAM usage, its not related to files or ParaView at all.