no `

whitelisted resource pack modifications are listed here https://bit.ly/extrarules

1. the size of any section of the graph doesn't necessarily dictate how many of that block exists (there could be any number of mob spawners)
2. blockEntities up to 3 chunks outside your render distance remain loaded and will still show up on the pie chart. This is why just dropping your render distance by 1 won't unload spawners/other blockEntities. You have to drop it by at least 4 to unload it. Example: If the spawner loads in at 15 chunks, you should decrease your render distance to 11 (press Shift-F3-F four times), then increase it to 14 (press F3-F three times). Reopen the pie chart and the spawner should be gone.

can you describe what exactly is wrong with gameRenderer? if i were to guess, you probably have entity culling on in minecraft video settings (it should be off)

julti is windows only

https://github.com/skillphobia/MacOS-multi-instancing-with-Keyboard-Maestro

tldr: yes

https://github.com/draconix6/Julti-CustomWall

this wouldn't be allowed unfortunately, however you may use a tool like BorderlessMinecraft: https://github.com/Mr-Technician/BorderlessMinecraft/releases