Classic Widgets is an official plugin maintained by the WordPress team that restores the previous (“classic”) WordPress widgets settings screens. It will be supported and maintained to 2024, or as long as is necessary.
Once activated and when using a classic (non-block) theme, this plugin restores the previous widgets settings screens and disables the block editor from managing widgets. There is no other configuration, the classic widgets settings screens are enabled or disabled by either enabling or disabling this plugin.
本插件不提供设置界面。插件一经激活，便会恢复过去的经典 WordPress 小工具设置界面，并禁止使用区块编辑器管理小工具。
Does this work with full site editing and block themes?
No, as block themes rely on blocks. See Block themes article for more information.
Update for 5.9.