How to lock a hitpoint

Operation manual pg 478 :

“To make sure that a hitpoint is not accidentally filtered out, lock it by pointing at it and clicking.
The tooltip Lock Hitpoint is shown.”

Well I can’t see it, I can only see the little speaker for playing the hit point, a cross to disable it, or a move icon.



I know its there; I’ve used it myself… can’t quite remember though, is this the one with using a modifier (CTRL or ALT) before clicking…? Sorry, not at the machine now…


Thank you,
I found something, its very hit and miss (no pun) it sometimes comes up when you hover over the little triangle at the top. The manual could be clearer and I would not like to do this on a laptop.