The oscilloscope settings can be found in the preferences menu. Here you can adjust the appearance and functioning of all oscilloscopes at once. All settings are saved and reloaded next time you open the app.
Time rage and amplitude range affect the visible range of data. For an uncalibrated device an amplitude of ±1 is the full scale maximum. However if you calibrated your device to a defined level of your hardware environment you might observe values above that range if clipping occurs (in that case you should decrease the gain/level of your hardware and calibrate again).
The other visual options include automatic peaks and the coordinate system. Peak values in the positive and negative range are indicated by horizontal lines, which inertially adapt to the current level over time (making them easily readable). Furthermore, the oscilloscope is capable of displaying the peak-to-peak amplitude value.
The oscilloscope has a trigger function that automatically finds onsets, which stabilises the graph for periodical signals. In that case you can greatly improve readability and overall usability of the oscilloscope. However, if you are analysing speech recordings or music you should turn the triggering off. The trigger level defines the amplitude threshold at which the oscilloscope scans for onsets. Adjust this value if you have problems to get a stable graph (due to noise or other irregularities).