NPC Zone Manager - Max Number Setting not there?!

Hi there!

I am just starting out creating may own map for Ark without any previous experience (was pretty heavily invested in mapping for the first UT though).

All tutorials I´ve seen so far mentioned that there is a min and a max desired number of spawns in the specified zone.
I´ve created and linked a NPCZone Volume, and a NPCZone Spawn Volume box.
When setting up the NPCZone Manager i dont have an option for max desired number - so if i set my min desired number to 3, there are dozens of dinos spawning in my specified area…

Another problem I´ve run into:
After loading up the unreal editor the last time “boxes” don´t show up anymore. Please see the screenshot because I cant explain it any better in english.