I also find it a little bit confusing that the parent of a tab group is a regular tab, and would like to have "vertical" separators.
The way I have solved it for now is having a local html file that changes its own title via JS depending on the params received. If I want to create a vertical tab separator, I visit that file and rename the param, get a new tab title and then group the related tabs within it.
Of course, the new UI looks awesome!
pantulis In the meantime you could also just rename start page to whatever you want via this bookmarklet
Vlad Regarding the "horizontal tab problem", which I agree is difficult to solve because the horizontal tab bar lacks space perhaps it can be considered that in a horizontal tab the concept of trees of tabs disappears and presents a flattened tab view (as if "Show nested tabs" was disabled).
Not really sure I like this approach because it may confuse new users, but I would like to know what others think.
In Chromium broswers a group of tabs can be named. Like "Keyboard" in this example:
It would be helpful to be able to do the same for tab trees in vertical mode in Orion.
So in this scenario, the parent would be the name of the tab tree, and the rest of the tabs would fall under it.
Vlad That looks perfect
After looking a bit at it again, its a bit unclear to me if it ever appears as just a folder? or it will always show last selected tab in that folder?
Vlad I would like to say that this implementation looks perfect to me and is better than anything I could come up with. It works with both horizontal and vertical tabs, and I was not confused when following the mockup. 
Along with nested vertical tabs, I'd like to suggest folders or groups for vertical tabs.
The ability to drag and re-organize vertical tabs is very helpful. However, I find it doesn't necessarily always make sense to organize tabs under other tabs.
What I would like is to be able to name a tab group, e.g. "Social Media", and then drag and drop relevant tabs under this heading.
This is very similar to the extant functionlity of being able to drag and drop tabs into nested hierarchies, but adds the ability to add a name that is not a tab itself.
These could be implemented as folders that could themselves be nested. I.e., within "Social Media" you could have tabs as well as another folder.
Hey all --
just chiming in to add another voice to the cause.
Would absolutely love to see the ability to add folders to the vertical tab sidebar for help organizing. It's one of the features preventing me from using Orion full time. In the mean time I'm using Firefox w/ a customized Sidebery extension.
Thank you all for your hard work.
Looking forward to it.
Wait what happened to this!? There's an AMAZING UX exploration above in the thread from like... over a year ago... and it looks PERFECT and I want it today! How can we get this!? Do you need beta testers??? Holy cow was I thrilled to see those screenshots. Please add this ASAP!? 
Yeah I am waiting for this to be released because it would be a true game changer
Arc's new "live folders" that automatically open GitHub Pull Requests in a folder is a game-changer too. Would love some exploration into features like this at some point. First automatically moving tabs to a folder based on some rules and then maybe opening them proactively (ie. GitHub Pull Requests, JIRA tickets, et cetera).
There is another post from Dec 2021 asking for this feature. They included this screenshot:
. I think this is great when the tab bar is is dragged to the left as far as possible!
However, I would also love the option to label these dividers such that, beyond just a visual degree of separation, when the sidebar is opened the label becomes visible. I've spent a little bti of time editing a screenshot of Orion to show what I mean: 
I'm not anything more than a beginner programmer, so forgive me if the language is incorrect:
I imagine that an intuitive way for users to create tab groups would be to right click in the side bar (or set a shortcut to accomplish the same thing), and create a new divider.
The divider could just be initialized with "Tab Divider" as the title, but upon creation of any tab divider the user would be able to rename the tab divider title to whatever they want. Furthermore, double clicking on the tab divider title would also allow users to rename the tab divider.
Users could drag individual tabs under respective tab dividers, and perhaps users could select multiple tabs using shift or cmd, but I understand if implementing this change would cause other issues.
Another feature that could be very useful would be collapsing dividers. Dividers might have a chevron next to them that, upon clicking, would toggle collapsing. I personally do not need that, but other people may like it.
I believe Arc has this feature, but I find Arc to be a pretty crappy browser in every other aspect. I do not have it installed currently and do not wish to install it which is why I cannot provide a screenshot of this.
