Xperia X, signal messenger and sms

I’m currently using an Xperia XA2. My wife is using an Xperia X. On the XA2, when using signal (signal android app), signal only shows messages sent and received via signal protocol. This is a good thing™. However, on the X, signal is showing both received sms and messages received via signal. This is annoying. I tried several options, but could not find any that would prevent signal messenger from displaying sms.

Does anyone have a trick for this ?

Same here, but I also don’t know how to control this …