Google announced today that the new Gmail interface will be the default experience for users. The company first introduced the new interface earlier this year, but users could revert to the previous version. Users now no longer are able to return to the old interface beginning this month.

“The integrated view with Gmail, Chat, Spaces, and Meet on the left side of the window will also become standard for users who have turned on Chat,” according to a blog post from Google. “Through quick settings, you can customize this new interface to include the apps most important to you, whether it’s Gmail by itself or a combination of Gmail, Chat, Spaces, and Meet.”

Google claims that the new interface’s ability to be customized makes it easier to stay on top of what’s important and reduces the need to switch between different applications, windows, or tabs. It’s worth noting that, as a result of this new change, users will no longer be able to configure Chat on the right side of Gmail.

The company’s decision to make its new user interface the default experience is unsurprising, but it will most likely be a frustrating change for users who preferred the old design.