This reminds me of a t-shirt I got at some Atlassian event a few years ago. It says "You </> me" and I haven't the slightest clue what that means, but it looks cool.
To be fair, some of the graph icons make at least some sense, if you see the nodes as Git commits (three node graph - diverging commits - new branch, two node digraph - combining commits - merging - pull request).
On some repositories I visit[0], it defaults to being shrunk. I didn't even recognize that the column of icons was supposed to be a menu. It took me over a half hour to figure out how to submit a pull request when I wanted to make a contribution. (I don't mean the time to figure out their code or build system. I mean the time spent clicking through the site after I had a branch ready.)
Tooltips do come up but you have to put your mouse on the icon itself, if your mouse is on the enclosing button and the button is highlighted, the tooltip won't come up until you move the mouse to the icon itself.
1. <>
2. </>
3. a one node graph
4. a three node graph
5. a two node digraph
6. the refresh symbol
7. an arrow pointing to a cloud
8. a page
I have no idea what any of these mean and I hate it. Plus, it takes 8 seconds to load anything so if you click on the wrong one it's extra annoying.
If anyone's curious, the answers are:
1. <>: source
2. </>: source, as far as I can tell it's the same button again
3. one node graph: commits
4. three node graph: branches
5. two node digraph: pull requests
6. refresh symbol: pipelines
7. array pointing to cloud: deployments
8. page: downloads