Sidebar on all tabs

You can edit any xenforo template and add a xf sidebar via using the xf:sidebar template syntax. That isn't the issue tho.

The issue you'd face is that most of the sidebar blocks on the overview page depend on data being fetched by the actionView in the Showcase Item Controller (which is only for the overview page). Other pages (Custom Field tabs, Reviews, Gallery, Map etc) each have their own action in the controller (actionField, actionMap, actionGallery, actionReviews etc) that only fetch data pertaining to that specific page. You'd have to heavily modify several actions in the Showcase Item controller (adding all of the fetching from the actionView method) so that the data required by most of those sidebar blocks is sent to the template. Its a fairly significant customization.

With that said, if you only need the SHARE BLOCK, that is a Core XF Macro that you can add to any page (doesn't have to be in the sidebar, it can be displayed pretty much anywhere).

What blocks are you mainly concerned with? I can let you know if its possible to include them without programming.

 

The Item Information block SHOULD work. The "More in and More from" will NOT work without programming (as the action does not fetch that data). The 'Join discussion" MIGHT work (might add an additional query). The Share block should work, except its going to share the PAGE taht its on, not the link to the Showcase Item (so if you are viewing a custom field tab, the share would link to that page, not to the Overview). That would greatly effect the ability to share on sites like Facebook and Twitter, because there is no ld-json being provided for sub pages.

Use an inspect tool to see what elements are available in the location that you are needing some additional spacing, then use one of those classes in Extra.css to add some padding (top or bottom).

 

I put some examples together for you tomorrow.

 

You'll need to bump this again late Fri/early Sat to remind me or I will forget (maybe even start a conversation about it).