Editing method seems to have changed

Please could anyone help? I've come back to make final edits to a website and the editing method seems to have changed on the home page and any new pages I add. I've attached screen shots below - the first two images (showing text box between photos) are what I'm used to, the last 2 images (showing silhouette images & text) are how it has changed and seems to work completely differently.

Any help greatly appreciated!!! Thanks

You're page has been "upgraded" to Fluid Engine. Did you click on the Upgrade button in the corner? Sadly there's no way to undo that step. It may also on your website now be the default for a new section, but you may be able to opt out if you are a Squarespace Circle member. When adding a new section you can also add a new blank section with "Classic Editor" to retain the editing system that you're used to.

This may be a helpful resource:

https://support.squarespace.com/hc/en-us/articles/6421525446541-Fluid-Engine-Squarespace-s-latest-content-editing-experience