That means you didn’t upgrade it to 3.3.3. How exactly you updated it to a newer version? Have you changed the version in package.json and used command yarn install or npm install? Or another method?
Try yarn strapi version or npm run strapi version inside the strapi project to see its version.
Still i was not able to create a new collection type please help me out .
This issue i face - Strapi is in production mode, editing content types is disabled. Please switch to development mode by starting your server with strapi develop.
Same issue- Strapi is in production mode, editing content types is disabled. Please switch to development mode by starting your server with strapi develop.