Switching Focus between Lists in the Sidebar
The TAB key is your best option.
You can't specify a specific list switch focus on, but you can cycle up & down the list.
To Toggle one Group "DOWN" use: TAB
To Toggle one Group "UP" use: SHIFT + TAB
To toggle through the groups list items, like open editors in the open-editors section, logged file-saves in the local history section, files in the file explorer, and/or the many other groups/sections available in the sidebar...
use the UP & DOWN Arrow Keys.
This is how all html lists work. VS Code is written in HTML FYI (you probably new that, but I threw it out there for clarity's sake). When interacting with a page that has been rendered from an HTML document, the TAB key will always switch focus between base elements, and will never cycle through an elements children. If you cycle through elements, such as an ordered list (<ol>
), or an unordered list (<ul>
), you can cycle through their list items (<li>
) using the UP & DOWN Arrow Keys.
VS Code is no exception, in fact the entire editor can be cycled through using the keyboard. There are many disabilities that this functionality accommodates.
And FYI, your theme, if well developed, should highlight where focus is at. I find many developers will remove that highlighting to create the desired visual effect, but doing so is naive, as its there for a reason.