Hi, I am Dave, I will help you with this.
1
Open File Explorer, then click the 3 dots at the top and select Options
On the resulting dialog, are the 3 options in the Privacy section enabled?
2
Is it just folders that are not appearing in the Home section, or is it files and folders not appearing there?
If it is just folders, there is a problem many people have reported that only folders do not appear in the Home section, and until that bug is resolved, in the left navigation pane, right click an empty spot, disable 'Show All Folders' and the pinned folders should appear in the left navigation pane.