How to remove the "Switch to Glass" banner from the cPanel interface

Introduction

In cPanel 96 we added the new Glass style to Paper Lantern.  When users access their cPanel accounts they are presented with a banner asking if they want to try this, which has the following text:

"Introducing our new style, Glass.  A clean, elegant take on our classic design.  Try it out.  Let us know what you think."

Here is an example of what this looks like in the interface:

To avoid confusion to end-users, some server administrators would prefer to remove that banner.

Procedure

Removal for existing accounts

The following API command will remove this banner for existing accounts on the server:

echo '{"personalization":{"xmainNewStyleBannerDismissed":"1"}}' | uapi --user=username --input=json --output=json Personalization set

Removal for new accounts

The following commands will keep the banner from appearing for all accounts created in the future on the server:

mkdir -pv /root/cpanel3-skel/.cpanel/nvdata/
echo -n "1" > /root/cpanel3-skel/.cpanel/nvdata/xmainNewStyleBannerDismissed