The current display above the entity has the following problems: it can be blocked by the entity's model, and it can block the player's view when mounted.
Available methods: Compatible display on waila's highlighted display box; Instead of displaying entity level, display area level somewhere on the screen.

Since non-hostile creatures are also affected by the level Modpack need to perform complex operations on the blacklist which is hard. Could U plz add a debug stick,and can add the blaklist by right clicking the entity. If this is too much work, will it B possible to add collective banning of non-hostile mobs and collective disabling of bosses？

Please make a separate issue, this is not related to the original post.

Available methods: Compatible display on waila's highlighted display box;

Can you provide a link to the mod that you are talking about?

https://www.curseforge.com/minecraft/mc-mods/jade
waila for forge

Added in version 1.11