cPanel is phasing out the Lantern Theme. You can upgrade your existing and future users to the Jupiter them using the following steps.
Change the cPanel theme in WHM
Update the packages with the new cPanel theme
Step 1
Navigate to WHM -> Home -> Packages -> Edit a package
Step2
Update the theme in the package to Jupiter. Changing the package will re-apply the settings of the package configured services.
Update multiple users with the new theme.
Step 1
Navigate to WHM -> Home -> Multi Account Functions -> Modify/Upgrade Multiple Accounts
Step2
Select the users you want to update and select the new theme. This will update the theme.
Change the cPanel theme as user in cPanel
Step 1
In the Lantern theme, select the Jupiter theme in the General Information block.