No, yes and yes

Is it necessary to uninstall 2.2.2 before upgrading to / installing 2.3.1, or will it install over the top of 2.2.2? 

Will all setting remain the same?

Correct, TinyPortal does not set forum width

Try this mod: https://custom.simplemachines.org/index.php?mod=4223

Marking this solved now: please open a new topic for new questions.

Thanks, it works like a charm!

One more question that I don't want to open a new thread for: I increased the width of the left panel, but then the main reading space decreased (which is expected). However, the site has some extra space on the sides that the contents could use – how can I make the contents wider? I highly suspect it's the theme's setting though, not TinyPortal.

You can do that using the block behavior setting.

Create an extra recent post block in the top panel that only shows on narrow screens...

Not sure it's right to reopen this thread, but this other question is also about the Recent topics block, and I thought I'd save you one thread ID.

We have our Recent topics on the right panel and it renders perfectly on desktop. We love that. However, when I browse the site on mobile, despite I'd be curious about the recent topics first of all, I need to scroll way down below the shoutbox, articles and user panel where I finally find the list of recent topics. It looks like if only one narrow column is available, the middle panel is being rendered on top, then the left panel, and only then the right panel which contains my precious Recent block. Is it possible to get the right panel, or specifically the Recent block rendered above the middle panel in mobile view, without changing anything about how the page is rendered on desktop? The right panel is only to be rendered on the main page, it isn't rendered anywhere else.

I've digged through the TinyPortal panel and block settings, but I couldn't find an option to set the render order for panels, or to set an order for blocks regardless of their panel (which could make sense in mobile view, because there you have only one "panel" really).

Logged: https://github.com/Tinyportal/TinyPortal/issues/1053

Apologies. I thought it was classed as Solved. My mistake.
Thanks very much in looking into this.
Chris

Who says it is solved?

I had a look into the code and as far as I can see now the code is expecting either 'rss' of 'feed' in the url, so that would explain why this feed does not work.

I will raise an issue in github and we will see it this functionality can be added / altered in a future version of TinyPortal. It is not something that is a simple bugfix. It appears the original code is not built  to deal with these addresses...

How is it solved if it doesn't work?