Classic themes disable WordPress FSE features like editing templates and site-wide styles.
Theme Blocks Full Site Editing (FSE)
Key Points: WordPress 5.9+ introduced Full Site Editing — but your theme says “nope.”
You go to Appearance → Editor expecting full design freedom — but nothing’s there. No templates, no global styles. That’s because your theme isn’t FSE-compatible.
❌ Why It Doesn’t Work
- Theme lacks
theme.jsonfile - No support for block templates or template parts
- Uses old PHP-based layout system instead of block system
🛠️ Options
- Switch to a block-based theme like Twenty Twenty-Four
- Create your own
theme.json(advanced users) - Install a hybrid theme that offers partial FSE support
⚙️ Good to Know
FSE is the future of WordPress design — investing in compatible themes now saves hassle later.