Once you switch away from horizon, you’ll need to go into your user preferences / interface option to change your color palette to something else you’d like.
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In that case DiscourseHub and/or iPad/iPhone is in better situation, because I didn’t need change back anything.
I don’t know if that comes from Horizon, because same happened just a minute ago and I’m on Default.
With horizon, I am unable to scroll to the very bottom of a topic list with the composer open.
Here’s what it looks like with the default theme. There appears to be some empty space below the list to account for the composer. There’s also the nudge to start a new topic which I always liked.
With Horizon, there is not enough space at the bottom, so you have to minimize the composer to see the last few topics in the list.
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Hey! This happened on the preview 
I had behavior like that too on my personal site but was unable to replicate it so not sure what to report. Closing the tab and reopening it worked for me.
Even now I don’t know how to replicate it! Maybe it has to do with an unsupported theme component or plugin? not everything has been tested yet.
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Will be fixed by the combo of UX: fix scaling of translator button in topic-progress bar (#270) · discourse/discourse-translator@0908e23 · GitHub
and
This will fix it
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This will probably be fixed too, but the review queue also needs bottom padding when the composer is open. Not sure if you can see it, but the content of my post is also flowing outside the composer when I’m on the review queue.
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That did the trick, thanks! However, this could cause confusion for users if their theme colours did not revert. Is there a way to switch it back to the palette of the theme before the change of theme?
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Using desktop here on meta (with a ~1400px wide viewport), I’m finding this to be a problem for myself as well.
To get a sense of whether to read a given topic, I’m finding myself having to scan the left to see the title, and then the right to see the category, and then back and forth, back and forth.
I’ve been using this theme on our internal site for weeks and only felt it on occasion there, but here, it’s really sticking out to me.
I don’t know what to make of this yet, but it’s one of the things that’s jumping out to me at the moment. I’m not sure I want the avatar on the right, but I do feel like I want the category on the left here.
Also notable is that on mobile, this isn’t an issue for me – the screen is narrower and the category is on the left.
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I like it. But. Can’t the middle be more stretched?
I mean this shape should be on the entire field, not centered.
Congrats for Horizon, it looks pretty!
However, table of contents is not displaying well. Take the Discourse AI topic as example.
Here is how it is shown with the Default theme.
And here, with Horizon.
Edit: I forgot to say I am in Windows 11 with Firefox 136.
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Love this theme — at least on desktop (haven’t tried it on mobile yet). Great job! 
That said…
- The Categories page still feels a bit too old-school and could be better harmonized with the rest of the theme’s design and layout. Maybe something like “category boxes” with rounded corners?
- Also, I’m not a fan of the “new topic” icon. I didn’t like it before, but now it feels even more out of place alongside all the updated visual cues like category, pinned, hot, last changed, etc. I think it deserves something new — and better.
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This is really just a side effect of how we are approaching testing out this theme. We do not plan on re-working how color palettes are applied per user when switching themes.
The issue will mostly be non existent once this theme is officially useable.
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A serious problem with Horizon topic cards: in the private messages list, there’s now no longer a way to see who’s in each PM topic, especially if I’m the person who replied last in the topic.
It just shows the PM title, and “dfabulich replied on [date]” and nothing else, especially not who else is in the thread.
I was skeptical of removing the avatar list on the public topics list, but the list of participants is what defines a PM topic, especially since they don’t reside in any “category.” The avatar list should be restored at least for PMs.
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Oh look I just found an issue!
New A16 iPad running the latest version of iOS 18.4 on the discourse hub app.
All, Topics, and Replies on the new tab get overlapped by
“Hot” topics.
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Agreed, this is on our list for improvements! I’ll add that to the OP for clarity.
Ah, I believe this is because you’re in the new-new-testers group, which is demoing an experimental change to how we display new and unread topics. I can add this to our list to patch up but since this is not available outside of the group’s members on Meta (to my knowledge), I’m not sure how quickly we’ll get to it.
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Finally also got to test this a bit.
In agreement with what others have said:
- I like that you got rid of the no. of views here
- I generally like that the design of the topic cards is cleaner and focuses on the essentials
- I’m not convinced that moving “New topic” to the side bar is a good idea
- Similarly, I’m not sure if the “welcome back” is really needed - it seems like something that should be displayed only temporarily at best
In addition:
- The default font size seems really large to me, especially on Desktop. This also creates the need to scroll in the side bar to see all items (last item I can see is “All tags”). I know I can bump it down, but maybe it would be worth revisiting the default.
- Because the category is now on the right, there’s basically no alignment between the like and reply info blocks, which creates a bit of a restless impression
- Setting the theme to full width, there’s a lot of white space on Desktop. I would prefer to at least have the option to not use full screen here (on mobile, things are fine).
- While I generally like that category and tag filters have moved to the right, it highlights that there is a fair amount of redundancy in terms of navigation (three options to navigate categories, two options to navigate tags). I tend to say this is a general design problem Discourse currently has, but the Horizon theme emphasizes it.
- This also makes me realize: it seems there are no tags on the topic cards - have they been omitted by design?
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It looks like the sidebar on the left serves as navigation, so the “new topic” button seems misplaced there. It aligns more closely with the options on the top bar, next to the search and chat button which are also actions. After all, although the a new topic defaults to the current category, you can actually create a topic anywhere on the forum.
As highlighted earlier, I also found the abundance of ways to access categories and tags to be confusing. I am in favor of removing the drop-down menus for categories on tags currently on the top right, since all of that is handled by the sidebar.
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