Hi @Erik Edlund ,
You could add a script to achieve this, get the button like the blow. The title could be different based on your site language.
Add the spfx react-script-editor: https://github.com/pnp/sp-dev-fx-webparts/tree/main/samples/react-script-editor . Then add the below code in it.
setTimeout(function(){
document.querySelector("button[title='Expand content']").click();
},1000);
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