Fix a Wordpress Content Editor Problem

My wordpress editor has been limited to only Gutenberg block editor. The option to switch between other editors like elementor, CMSMasters, or even Classic Editor isn't available.

I have installed many plugins to disable Gutenberg and the issue still persist.

I have updated my Wordpress core, themes and even switched to default Wordpress themes, problem is still there.

I will appreciate it if you can help fix this and whatever the solution maybe, I am open to it.

Thanks.