improve keyboard navigation on the setup page

Is your feature request related to a problem? Please describe.
On the setup page the selector jumps over the Show more elements (required for accessing any bridge options) when using keyboard-only navigation in a web browser (the Tab key). This is an accessibility issue.

Describe the solution you'd like
Include the clickable Show more area as an element which can be selected with the Tab key.

Describe alternatives you've considered
N/A

Additional context
Doesn't only affect people with disabilities, many vim users in particular tend to prefer browsing with keyboard.

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dev.2023-07-11 (git.master.1f6c2cd)