This is a little hard to explain. If it is really confusing ask, I'll try again.
If I create a new style in highlighting, and then move to the visual filter and try to use that new style, it does not show up. I have to close both the highlight tab, and the visual filter tab, and then open them back up to use my new style.
Not a giant issue, it was just annoying while I was doing a new visual filter, and saw the "need" for a couple of new styles.
Was also able to crash L4 somehow while playing with this right now, actually my 3rd every crash - but opened right back up.