How to change font size, speed, margins, colors, and the reading line

In the prompter, click the gear ("Settings (S)") to open the drawer:

• "Base speed (WPM)" (50–150; the − and = keys change it by 5; voice commands like "Hey Fox, set WPM to 180" accept 80–400).
• "Font size" (24–160 px), "Line spacing" (1.0–2.5), "Left margin" and "Right margin".
• "Reading line position": where the current word sits, as % from the top. A blue "Reading line" guide shows while the drawer is open.
• "Voice tracking strength": how hard the scroll works to keep your spoken word on the reading line. Raise it if you read faster than your WPM.
• "Text color", "Background", and the "Mirror mode" checkbox (M) for glass teleprompter rigs.

The floating window keeps its own separate copy of these settings.