Hello @Priti Rajguru
It is not possible to set the instance to use only the legacy editor.
The legacy editor is available for pages that were migrated from an on-premise Confluence instance to the Cloud instance.
If you need a new page where you can use the legacy editor, make a copy of an existing page that still opens in the legacy editor and then remove all the content from the copy and add your new content.
If you have a migrated page that you updated to the new editor and you want to revert it to the old editor, you can do that by going to Page History and restoring an older version of the page from a date before you converted it to the new editor.
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