On the left, it’s the floating terminal with neofetch. On the right - the notification center (SwayNotificationCenter), which can opened with clicking on the bar.
NixOs icon on the left side of the bar opens nwg-drawer, which is shown on the last screenshot)
I use Hyprland with mouse without any problems. Though, I have MX Master 3s, it has additional button, which’s mapped to Meta in my case. Also, there’s a right click menu, implemented with ags (similar to openbox menu). So, I can open, close, resize and move windows just with my mouse