Returning Member

Reducing my withholdings so I don't get a tax refund

How do I reduce my withholdings using the new (since 2020) W4 form? is it the 4b cell? If so, how can I figure out how much I need to withhold to make my tax refund zero (i.e what numbers do I need, where can i find them, and what equations do i need to plug them into)?