For removing the QR Code & the "Create Post" button from your wall, go to your "Content" settings and turn off "Direct Posts" :
If you want to hide the button, but not deactivate the feature, use this custom CSS snippet:
#createPostButton {
display:none;
}
If you want to keep the button but remove only the QR code, you can turn off "Enable QR code" in your "Content" settings:
In case you have further questions, don't hesitate to contact the support team via the chat or support@walls.io!