I cannot view my pages in my the view page option neither in my site

Hi team, i am going to try to be very specific in order to help you to offer assistance.

1) My 1st problem is that i cannot see any page.post,portfolio entry in the view page within the Dashboard. The pages in the site are not shown either. Only the main page works. When i press at any post,page,portfolio entry the view page option i see a page that looks like a blog .

2) In Google Console i get warnings about several pages. Most of pages used to be posts but the warning i saw was for products. (insert aggregate rating etc) but i am not using woo commerce. I also get an error notification that my post is recognized as a webpage and there 16 errors in the structure.

This is the reason i tried to duplicate my posts as portfolio entries and as pages as well in order not to change the permalinks of the posts.

Somewhere between all this i did something wrong (i did not made any changes to code apart of the custom css code suggested by a moderator in a previous post for aligning the featured image in pages.

Looking forward to your valuable help.