Welcome to the QuickBooks Community, Leah. 

Thank you for reporting about the missing Custom form styles menu under SETTINGS. I see how important this is for you, knowing you’re always editing your email template. I will help you out.

Know that there have been no changes to our system, and I’ve checked this on my test accounts, and the menu is there. Therefore, this behavior could be caused by random browser issues, which we will find that out as we go through the steps.

We can start by signing in to QuickBooks using a private window. This step prevents your browser from re-using the stored internet files in the cache, which includes data for Custom form styles or menus in general. Therefore, QuickBooks loads up fresh information from Intuit's server.

• For Chrome, press Ctrl + Shift + P.
• For MS Edge and Mozilla Firefox, press Ctrl + Shift + P.
• For Safari, press Shift + ⌘ + N.

If you see the menu, you'll want to go back to your regular browser and clear its cache. However, if it's the same thing, you'll want to use a different browser to isolate the issue.

Let me know how the instructions above work for you, so we can assist you again if the issue persists. Take care!