Version : Office 365 (SharePoint 2016? 2019?)
I didn't create those sites.
The structure is as follows :
- Site collection A = hub site
- Site collection B = site collection that's part of A's hub.
I observe that B has a Seattle layout. Most other look options are disabled because it's part of a hub site so SharePoint doesn't let you change them. The left side bar is VISIBLE.
I observe that A (he hub) has a Seattle layout too. When I go to "Change the look" --> "Navigation" I observe that "Display the navigation" is set to "Show". And yet the left side bar is NOT VISIBLE.
Question: What can cause the side bar not to be visible on site A? I can't explain it. I don't believe the users had enough knowledge to implement any fancy page layout or CSS. Itäs got to be basic SharePoint.
(While writing this I can think of one possible scenario : This specific page of site A is the home page. It might have a layout that doesn't have the side bar?)
EDIT: The page I was looking at on A is home.aspx so it might indeed have a special layout. I don't remember if that's how it's supposed to be.
EDIT 2: No, I've check a List page from site A and the Left Nav Bar is hidden there just like on home.aspx, whereas a List page of B does show the Left Nav Bar. What causes the difference?