Autobuild has many settings. Generally, when running an economy you typically want a certain % of your pops/workers to work on something. For example, by default you need 1 hydroponics farm for 100 pop. That means you need 1% of your pop as farms. The autobuild can target that.
Similarly, maybe you want 20% of your workers to work in components factory. Then you can % worker share to achieve that.
Finally, since your industrial power scales with workers, buildings without a worker demand (such as glass smelter) can be set a % of workers target to make sure it stays correlated to it.