LT() and ignore mod tap interrupt

[GreyHands]

Hello, I use LT on my home row and had many issues with the layer tap being recognized instead of the keycode.
I usually compile my firmware and could not find a solution following the documentation (seems that IGNORE_MOD_TAP_INTERRUPT would be the solution but it has been removed and should be the default behavior now).

By chance I opened vial gui (v0.7.1) and noticed the menu in the screenshot below, under QMK Settings/Tap-Hold, I checked "Ignore Mod Tap Interrupt" and now no more typos or missing characters while fast typing.

Now my question is what I have to use in my config.h to have this turned on?

Thanks