The rail and its places, on a desktop and on a phone.
A project opens at flexos.me/b/<project>. On a desktop it is three columns: the rail on the left, a list beside it, and the thing you picked on the right. On a phone the list is the screen, the rail is a bar at the bottom, and a row opens over it.
The bar at the bottom has Chats, Library, a green + that starts a chat, Preview and More. More is a sheet from the bottom of the screen with People, Repo, Inbox, Connections, Agents, Settings, Help, the dark or light row, and All projects. Inside a chat the bar hides, the way a messaging app drops its tabs once a conversation is open.
Nothing pops up over a desktop: a sheet from the bottom is a phone's only. A desktop has the same things on the rail, in the side panel and in the header.
The chats, a chat's topics, the Library, the Repo, the builds, the Inbox, Work's Files, Tasks and Context, and the Vault's keys: each has one field at the top, above the rows. Typing filters the list. Where the list takes new things, Enter adds what you typed: a new chat, a topic, a task, a pin, a key of that name, your own domain.
Light is the default. Dark is one tap away on the rail's foot (More on a phone), on the site's nav, and on Your profile, and it is remembered on the device you set it on: a phone and a laptop are each set on their own. Your profile also has Grey rail or Green rail, the same way.