Be careful in the slicer. It’s not totally user friendly for this type of change. There are a lot of areas that appear to forget the settings. I’m not sure it matters but just look over everything. Below is the Filament profile where there is a HF dialogue box that mine never holds on to. When I update it to High Flow, the volumetric speed bumps up as expected. Again… not sure it matters, but it’s something I check.
Like @maximit mentioned, I’ve only seen changes to the Infill speed. So, again, make sure you are OK with the “improvements” before you hop in. It’s not at all what I expected.