The better option to set whatever fee rate that you want to use is to customize the fee. Static option five option for 1, 2, 5, 10, 20, 30, 50, 70, 100, 150, 200, 300 sat/vbyte. Assuming the mempool highest free priority is at 16 sat, you have no option than to use 20 sat/vbyte if set to static.