Always check shopifystatus.com first.
There’s also trying on a different browser, device, or clearing the cache.
If the issue continues advanced users probably should investiage using the shopify-cli, or themekit to work on theme code locally in desktop software.
Then contact shopify support advisors directly to complain about the new editor problems.
→ on the help docs here: https://help.shopify.com/
→ type “support advisor” to try and bypass the dumb chatbot quicker.
Though this is just the sad state of affairs you can probably come to expect after they decided to force a full blown bloated IDE on merchants that’s 3x the size and 3x slower than the old reliable editor; if it even works.
Imagine making everyone use a jackhammer when they just need a hammer, then the jackhammer keeps breaking.
See all previous complaint threads: https://community.shopify.com/search?q=new+theme+editor