Had everything lined up, then “gutenberg” jammed it all together.

Prefer to stick with the familiar Classic Editor? No problem! The Classic Editor plugin restores the previous WordPress editor and the Edit Post screen. It lets you keep using plugins that extend it, add old-style meta boxes, or otherwise depend on the previous editor. To install, visit your plugins page and click the “Install Now” button next to “Classic Editor”. After the plugin finishes installing, click “Activate”. That’s it!

There are many useful sources about the new Block Editor (Gutenberg), for example:
– https://www.ads-software.com/gutenberg/handbook/
– https://www.ads-software.com/gutenberg/
– https://www.ads-software.com/support/article/wordpress-editor/
– https://gogutenberg.com/
– https://www.ads-software.com/gutenberg/handbook/reference/faq/
– https://www.wpbeginner.com/beginners-guide/how-to-use-the-new-wordpress-block-editor/
– https://www.wpbeginner.com/beginners-guide/common-gutenberg-questions-answered/