Whatsapp content hidden on lock screen?

I have a question about the Huawei Mate 10 lite.

My WhatsApp messages on my lock screen are only sent to me with e.g. B "2 messages" is displayed, i.e. The content is completely hidden

Unfortunately, I do not find the right setting so that my messages are displayed again in full

The question is, does any of you know what to do?

First you go to the settings in WhatsApp and then to Messages. There should then be a switch with "Show preview".

Thank you for your quick reply

Unfortunately I have no switch with "Show preview" at least not when I go on notification