Restore and enable the WordPress classic widgets screen and disable the Gutenberg block editor from managing widgets.
Some of these releases are full new versions or critical security patches, they also bring unwanted changes to the back end for example "the Gutenberg" Uses a Blocks system to compose and format content, in other words; a more complicated way to create a simple post.
Witten Tutorial:
https://www.avoiderrors.com/?p=48371
Classic Widgets Plugin:
https://bit.ly/3xOFo1x
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