In the main window, a status bar at the top offers quick access to the current status and functions. The items in the status bar are described from left to right:
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Displays the name of the loaded project

This is the amount of time LiveProfessor currently takes to process all plugins. It must remain lower than the buffer size and can be monitored over time in the Audio Performance panel.

This section displays the current sample rate, buffer size, and buffer size in milliseconds. Clicking on it brings up options to change both parameters.

These are two indicators showing a red warning if processing takes too long, something that will cause click, pops, or crackle in the audio.
Clicking on these indicators will reset their status. There are two indicators:

Internal: This measures the time it takes for LiveProfessor to deliver audio to the audio driver. If delivery is on time, the indicator will be green. Otherwise, it will be red.

Device: These are indications of dropouts reported by the sound device. Even if LiveProfessor delivers the audio on time, other factors might prevent the audio driver from delivering it to the hardware on time. The driver then reports this back to LiveProfessor.
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This section gives you quick access to the Hardware Controllers features. The first part displays the current Controller Map. Click on the name of the map to switch to a different map.
Next is the Quick Assign button; this will put the controller into Quick Assign mode. Moving the plugin control and the hardware simultaneously, you can map a hardware control to a plugin parameter.
Last, there is the Map Editor button that opens the Controller Map Editor.

The upper text, in blue, shows the current Cue. The lower part in green, shows the next cue to fire when you trigger the Next command in the active cue list.

This section controls the project tempo. Use the Tap button to tap in the wanted tempo.
Tempo can also be controlled from the Transport & Tempo panel