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@Dragontrumpetare a simple search would have answered your question:
/t5/Xperia-XZ/Group-contacts-and-text-messaging/m-p/1184179#M2974
Doesn't matter, the update removed it.
After many tries, I simply can't write and send a group message. How do I create a group? And when I have written the message how do I send it to a group? When I tap at a kontakt, I found the choose-group line in the button, then I created a new group and marked the group box. But what do I do then? Sorry my pour english🤣
From my quick testing, it looks like one could use the Google Contacts app to access the groups that they've created and then send a group message. This app is restricted to certain devices (Nexus and Pixel devices I believe), but it can still be downloaded from a site like APK Mirror. You'll have to sideload it, but it works fine on my X Compact. I know that this is installing another app and the stock Sony one should have this feature, but at least it's a workaround. As a note, I'm not sure if this app will get updated through the Play Store since you have to sideload it.