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Thanks for visiting the Community, @dennis24. There are times that our browsers hold too much cache. When it happens, that will make them behave unexpectedly.
To isolate the issue, let's perform basic troubleshooting steps on your main browser if it works with the private or incognito window.
First off, sign in to your QuickBooks Online account using an incognito or private browser. Here's how:
Once done, try to save or email an invoice. If you can finally find the option, follow the steps to clear the cache of your regular web browsers. If the issue persists, use another web browser.
For future reference, read through these articles to learn more about fixing unexpected browser-related behaviors:
Feel free to visit again if you have more questions about QuickBooks. We're always around to help. Be safe.