In case you are not selling your hosting plans according to different plan tenures, then you can easily disable the top month's bar.
Here is the detailed procedure you need to follow to remove it:
Login your FTP > Go to WHMCS Dir > Templates > Hostx -> Includes -> Blocks
Find cpanel_pricing.tpl file and edit the file using file editor.
Remove the highlighted code after taking a backup. It will automatically remove the top month bar.
How To add 2 year or extra billing cycle??
Here is the detailed procedure you need to follow to add it:
Login your FTP > Go to WHMCS Dir > Templates > Hostx -> Includes -> Blocks
Find cpanel_pricing.tpl file and edit the file using file editor.