I've been using LLD a significant and constantly suffer from one thing:

When I'm in the list of Item prototypes and I need to go to the triggers or graph prototypes, I must first click on the Discovery(1) link and then click on the graph or triggers respectively. And vice versa. It is not very convenient.
So, need to make direct links to the item, trigger and graph prototypes.

See on a square in picture. I suggest to add one more line of direct links to which I said.
Also first to add a name as link to the discovery rule, which holds these prototypes - as is done recently for the of the host properties.
You can arrange GUI differently - at your decision, the main goal that you will understand what I said.

Second thought:
For Item prototypes is used button "Create prototype" for graph and trigger - "Create Graph", "Create Trigger" respectively.
It seem it is inconsistency. It better the button "Create prototype" for all elements, or individual like "Create XXX prototype".

And the reverse is what is shown in the picture.