Can an Aux (White) switch be used as a dumb switch?

I have a switch panel that has four switches on it. 3 of them are Blue 2-in-1 switches. The fourth switch however, I don’t need a smart switch for. The current dumb switch I have there doesn’t make the three beautiful Blue switches. Could I use a White switch as a dumb switch here as a replacement? Or can the White switches only be used as addon switches?

Just addons unfortunately.