Are there keyboard shortcuts?

Yes, the available keyboard shortcuts are below:

• Show/Hide shortcuts help page (Windows: Ctrl + / Mac: ⌘ + /)
• Show search message bar (Windows: Ctrl + Alt + f Mac :⌘ + Alt + f)
• Filter topics (Windows: Ctrl + k Mac: ⌘ + k)
• Previous topic (Alt + UP)
• Next topic (Alt + DOWN)
• Previous topic filter tab (Alt + Shift + LEFT)
• Next topic filter tab (Alt + Shift + RIGHT)
• Previous topic with unread messages (Alt + Shift + UP)
• Next topic with unread messages (Alt + Shift + DOWN)
• Edit last message (UP)
• Previous sidebar tab (Windows: Ctrl + Shift + UP Mac: ⌘ + Shift + UP)
• Next sidebar tab (Windows: Ctrl + Shift + DOWN Mac: ⌘ + Shift + DOWN)