Help: Changing database tables and /blog/ slug is not there

Hello,
I just switched a subsite into becoming the main site of the multisite.

After changing the postmeta and posts tables using Search & Replace DB plugin, it seems everything is fine.

However, I noticed that the url of posts on the main site do not contain /blog/ in the url.
I know WordPress forces that word into the url of the main site.

Is there some other tables I should be updating?
Or should I restore my files and redo everything?

Please help.