I can’t see Page/Post Settings under editor

Page and Post Settings are controlled by Flexia Core plugin.

Make sure you have the plugin installed.

Installing Flexia Core:

Way #1

Go to Appearance > Install Plugins page from WordPress Dashboard
You will see the option to install recommended plugins
Select “Flexia Core” and install.

Way #2

Go to Plugins page from WordPress Dashboard
Click on “Add New Plugin”
Search “Flexia Core” and install.