sfz mark?

Is the "sfz" mark in Notion supposed to make the note louder/accented?
It doesn't seem to be making any difference when I use it - all the notes play at the same volume.
Here's an example:

I read about the bug that can happen when you put dynamics above and below the staff, so I put all mine below - so that shouldn't be the problem. Any ideas, or am I misinterpreting what sfz is supposed to mean?
It doesn't seem to be making any difference when I use it - all the notes play at the same volume.
Here's an example:

I read about the bug that can happen when you put dynamics above and below the staff, so I put all mine below - so that shouldn't be the problem. Any ideas, or am I misinterpreting what sfz is supposed to mean?