Prime Tower Missing

I cannot find the setting for Prime Tower as shown. How do I gain access to it, and how important are they? I will have about 15 layers of blue, then 100 in white.

Thanks.

https://wiki.bambulab.com/en/software/bambu-studio/parameter/prime-tower

What if there’s not enough room?

Than you have to reduce the size of the prime tower and disable it completely.