Display current hp for NPC automatically through settings

I am trying to configure my game settings to always use Bar 3 to display NPC/Monster hp. I have configured my other two bars to display AC and Speed and it works fine. However, for HP, when I configure it, it does not display the current hp of the npc. Instead, I have to go into the token properties, and go to bar 3 and enter the current hp. The feature is partially working. The max hp are displayed in the second field when I open the token properties. Is there are way to do this? Can someone maybe send me a screen shot if they succeeded with this? Sorry if this was already posted here, but I couldn't find the answer. Thanks in advance.

By the way, I am playing D&D 5E if it matters.

Are the current hp set to max (or anything) on the actual character sheet?

I would suggest not linking the hp to the token for an NPC. This leads to all sorts of issues with multiple NPCs sharing the same hit point count. Here is the usual method of setting up an NPC token; adjust for your bar choices: Wiki article on  Linking Tokens to Journals Here is a  video  which demoes the procedure