How to add new resolution in "Scaled"

CPU: i3 10100 UHD-630

Os - Catalina

Default- 1240x786, 800x600

In Scaled: 1208x1240

My monitor supports 1366x768

I changed the value in UEFI/OUTPUT/Resolution to 1366x768 But it didn't worked

I want to add this resolution so what to do???