The header on Horizon works really well most of the time, across mobile and desktop: [image] [image] However, I’ve got a folding phone with a weird aspect ratio. Unfortunately the search bar and avatar disappear and everything goes a bit awry: [image] This seems to be for 640-767px width - unfortunately where my foldy sits!

heya Nathan, i have a fix here: [画像] Left side hamburger menu on mobile Theme component Hey @featheredtoast i have a PR here to fix the header issue with Horizon theme in viewport sizes for folding phones and some tablets. will let you have a look and merge it:

i can repro this too - the problem appears to be the contents class inside the header displaying grid at the folding phone/small tablet viewport size @media (min-width 640px) (max-width: 767px): [Screenshot 2026-05-20 at 7.23.06 PM] it can be patched up by changing the property to contents for that range of width: [Screenshot 2026-05-20 at 7.24.02 PM] @media (min-width: 640px) and (max-width: 767.98px) { .d-header>.wrap .contents { display: contents!important; } } i think discourse uses 768px for the tablet/desktop boundary edit: disabling this setting seems to fix it for me (i forgot this was still there): [Screenshot from 2026-05-20 19-50-46]

I find that setting makes it worse though!! With it off, the header is scrambled at all sizes up to 767 unless the device is specified as mobile. But at least my folding phone is happy. Just not my desktop browser when things get small.

[画像] Lilly: edit: disabling this setting seems to fix it for me (i forgot this was still there): [Screenshot from 2026-05-20 19-50-46] I think that this setting has now disappeared, so there is no longer a workaround. The problem still remains with Horizon.

[画像] nathank: I find that setting makes it worse though!! With it off, the header is scrambled at all sizes up to 767 unless the device is specified as mobile. [画像] nathank: The problem still remains with Horizon. Could you help me diagnose this, because atm when repro’ing via desktop sim (I don’t have a folding phone), I don’t see anything out of the ordinary.

I can reproduce it by simply narrowing the window of my browser on my desktop: When sufficiently wide: [image] A bit narrower, and a few weird things happen (sidebar / header go white) which I’m not super sure is intentional: [image] Narrower highlights the problem (i.e. folding phone size) [image] Very narrow (normal phone size) is fine again. [image]

[画像] nathank: A bit narrower, and a few weird things happen (sidebar / header go white) which I’m not super sure is intentional: It is. [画像] nathank: Narrower highlights the problem (i.e. folding phone size) I legit don’t get this, this is at 644px: [CleanShot 2026-07-24 at 10.14.29@2x] At no width does the avatar disappear for me. Can you repro this here on Meta (with Horizon)?

Ah - I forgot I could do that for repro stuff! No, it doesn’t repro for me on Meta with Horizon either. I guess this is a problem with my site then - I’ll go and troubleshoot it at my end and let you know what I turn up. Thank you for looking into it!!!

Wow, it was surprisingly easy to find the problem. This theme component isn’t compatible with Horizon: [画像] Left side hamburger menu on mobile Theme component One thing we never got around to and caused some confusion after our work on Full height, slide out hamburger menu was that the hamburger menu, on the right side, opens a menu from the left side. For those interested in rearranging the header, this is for you: [Screenshot from 2020-09-18 12-19-27] Mobile menus appearing in the upper-left corner of the screen is not very reachable single-handedly which is why this is a standalone theme component. Options, yanno? hammer_and_wrench … And I love that TC!! I can’t stand the menu jumping over to the right on mobile. It is the little things that drive us crazy (well, some of us), eh? Maybe I like it there because I’m left handed.

Yeah, I get that. Feel free to drop a note in the OG Horizon Theme topic, where we said: [画像]Horizon Theme Partial compatibility Please let us know if compatibility with this feature is important to you; that will help us prioritize improvements to the theme component / plugin or Horizon.

i use that component too (i feel the same way about the sidebar icon, although i don’t like or use horizon) and have done work on that component. i’ll see if i can do a fix for it Nathan.

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nathank (Nathan Kershaw) 2026 年 7 月 25 日午前 10:03 14

リリー、最高！折りたたみ式の端末で、左側のハンバーガーと『Horizon』を同時に楽しんでいます。

素晴らしい！！！

トピック		返信	表示
Mobile Header expanding after tapping hamburger menu Product Support	52	3798	2018 年 3 月 4 日
Horizon Theme Theme official , horizon-theme	73	9443	2026 年 5 月 28 日
Left side hamburger menu on mobile Theme component mobile	51	5329	2026 年 8 月 31 日
Reduce the size of the header Product Support	3	1249	2020 年 1 月 30 日
UI Error on mobile foldables UX	18	709	2026 年 1 月 30 日

Horizon テーマで中サイズビューポート時にヘッダーが崩れる

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