Wordpress removed the classic old widgets feature from WordPress 5.8 and replaced this with improved gutenberg block widgets. Block Widgets comes with some extra and advance features and now you can set and control your wordpress website widget area with new block widgets.But if prefer the old classic widget over the new improved block widget, then you can disable Block Widgets and enable classic widgets in your website easily with Classic Widgets WordPress plugin. It is a official plugin from WordPress team.
How to install Classic Widgets WordPress Plugin on your Website
Login to your WordPress admin dashboard. (wp-admin/login).
In your WordPress admin dashboard click plugins and select Add New.
Type User Classic Widgets in the search field and press the enter key.
Click the Install Now button in Classic Widgets WordPress plugin by WordPress Contributors.
After the successful installation click the activate Plugin link to activate Classic Widgets.
You can also download and install Classic Widgets WordPress Plugin manually from the below download link.
Go to Plugins-> Add New-> Upload Plugin and upload the downloaded plugin .zip file and install.
Enable Classic Widgets:
Just activate and forget. If you are using a non-block based classic theme, then this plugin automatically restores the previous widgets settings screens and disables the block editor.To enable the new Block Widgets jest disable this plugin.