UI regression in KDE Arianna - How can I back up and restore specific version of Flatpak package?

All I could find is how to make a list, and reinstall flatpaks from that list, as well as backup app data, however all of that assumes I want to do updates.

Meanwhile what I want is akin to extracting APK of a stable version of some app, backing it up and using it for years to come. For example that's how I joined these 2 screenshots, using JointPics from 2014 which isn't even on Play Store anymore, and targets API so low that it has to be installed via ADB. (Yeah, I am too dumb for GIMP)

As for the regression, you can see. On left is older Flatpak, on right is version from Arch repo. The Flatpak I originally installed as a hotfix for update that broke it completely at one point on Arch.
You can see the older version nicely fits the screen, splitting up text into columns.
Meanwhile the new version just does smaller page in middle of screen that doesn't even work properly with Breeze Dark theme, causing different background for text sections.

The only improvement is ability to flip pages rather than use arrows, but that's minimum.
Well, and maybe the progress keeping got fixed, but I didn't test that much.

Don't pay attention to the taskbar. I wish it could flip to vertical with different screen orientation. Yeah, the icons' clickability is a dice roll of what you tap.

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You can use the Warehouse app to do this: https://flathub.org/apps/io.github.flattool.Warehouse
Wouldn't recommend doing it with the CLI, they don't make it easy.

If you already have the correct version of the flatpak installed, you can try flatpak build-bundle.
flatpak build-bundle LOCATION FILENAME NAME where
LOCATION is the path of the repo on disk. Run flatpak info -l org.kde.arianna, and copy the part before /app
FILENAME is the output file name, preferably .flatpak. Eg: arianna.flatpak
NAME is the name of the app, here org.kde.arianna
The generated file can be installed with a double-click, or with flatpak install <file>
This is the equivalent of an Android .apk. It contains the app but depends on a runtime. If you want to install it in a few years, odds are the runtime will no longer be available. You can backup the runtime the same way with the --runtime option.
flatpak build-bundle --runtime LOCATION FILENAME NAME where
LOCATION same as earlier
FILENAME eg arianna-runtime.flatpak
NAME is the name of the runtime, which you can get with flatpak info --show-runtime org.kde.arianna
This takes a while, for some reason. Maybe it's compressing stuff?
The runtime is installed the same way as the app: double click or flatpak install.
Note: I only did this once, and not specifically on Arianna. Hope it works.

Are you sure not just the defaults changed? Or isn't it a problem on your end? On the project page the screenshot looks like the old version: https://invent.kde.org/graphics/arianna
Have you contacted the developers? They have a matrix chat. Maybe you found a bug, and it would help others if you would report it.
- It still looks like that, aside from the datk mode issue, but only in landscape orientation.
- Are you sure it's not a you problem? Or isn't it a you problem? Go read the docs.
  Have you contacted the devs? Reporting a bug would be helpful.
  Sorry to be so rude, but you really hit a nerve. It isn't even your fault.
  Anyway, rant time:
  KDE and bug reports. They always come to you like "Hey, bug reports are so really importsnt to us! And we'll guide you through it. Here's our lovely oh-so-helpful wizard!
  Except it ain't lovely. Nor helpful. The only thing it does is pop up whenever a KDE app has an aneurysm and asks you for a backtrace. And then... backtrace is declsred useless.
  Why even bother people with the stupid popup if in 90% of cases it's declared as useless. Why not do the backtrace silently and then annoy the user only once you declare the bug "useful".
  Last instance of this: I was using my KDE desktop. For some reason, Plasma seems to really hate me, because I need to fix default apps every few weeks. For some reason, jpegs and pngs open in Krita by default.
  So, wanting to close Krita, becuse I don't need an entire editor to look at a photo, with tools taking up 25% of the screen, when it asked me about the import resolution, I pressed 0. Krita proceeded to crash and open the report bug dialog.
  Not having seen the KDE report wizard for quite some time, I felt inclined to go fill out the report. Got through the first few pages just fine. Then came the backtrace. Sure, do it. I'd like whoever debugs this not snooping through a data dump containing god knows what, but sure. Then it gets called useless. AFTER you've taken 30-ish seconds of my life on preliminary questions.
  Look, if you're gonna ask people for input and discard said input if something unrelated happens, at least ask after the something unrelated decided it's not gonna be yeeted away. No need for the "Oh, wait, we don't really need this, it'll take too much time to play detective" after the user already passed three screens of interrogation.
  Anyway, the point is:
  KDE clearly doesn't care about bug reports. Because if they did, the guide on installing backtrace-enabled packages once the inevitable verdict of "useless" wouldn't be a wiki page with the generaal message of "find backtrace-enabled packages, you buffoon" when you could point to them.
  Another problem with this is: when a bug happens without backtraceable packages, how is the user supposed to recreate it if they don't know how?
  And besides, my bug is very recreateable. Open an image in Krita (preferably from Dolphin, after Plasma mangled the defaults, again and again). When prompted for some integer, enter "0". Instead of a generic error message, see the entire app sink into oblivion.
  Anyway, if anyone feels like reporting the totally useless report with totally unrecreateable conditions, feel free. I won't. Just too much work, for it to be discarded just like that by some wizard no one even thought through.
  And why would I contact the devs? Or rather, where could I do that? They're worse than government agencies, for god's sake. The right person or place just doesn't exist. Wherever you go to or ask, it's someone else's responsibility or your fault. And the wizard, that true single point of contact - refuses any contact just as consistently.
  So tell people to call the devs. Tell them it's their fault. Tell them to make a bug report. Say it just might help not just you, but someone else when all hell will freeze over before anything like that becomes even a remote possibility.
  Talk about adding insult to injury.
  
  Wtf man, developers are also people. Most of them doing this for free in their free time. You are the kind of entitled user who makes foss devs burn out. Never thought I will find one in the wild.
  I use krita frequently and never met your bug so it's not as recreatable or important as you think.
  Noone forces you to use krita. If it doesn't fit your workflow or if you think developers are deliberately sabotaging your work, you can switch to another free or paid alternative. If you would switch to a paid one, you could speak to a manager.
  In op's case I'm not sure it's a you problem. In your case I'm sure it is.
  
  There are plenty other DE or WM "fishies" out there.

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