Brother PTouch Label Maker stuck on large font

if it was me then I would look for some way to reset the device to factory settings

what AI says

"To reset a Brother PT-P700 label printer to its factory default settings, follow these steps using the device buttons or the utility software: [1, 2, 3]

Using Printer Buttons

1. Turn off the P-touch printer.
2. 
   
3. Hold down the Shift key and the "R" key at the same time.
4. 
   
5. While continuing to hold down Shift and R, press the Power/On/Off key once, then release all the keys.
6. 
   
7. The machine will initialize, and "English" (or the default language prompt) should appear on the display or status indicator. [1]

Using Computer Software

• You can also manage, reconfigure, or reset printer device settings by opening the Brother Printer Setting Tool installed on your computer. [1, 2]

Note: Performing a factory reset will delete all stored label files, custom configurations, and internal memory data. [1, 2]

If you are trying to fix a specific problem—like printing errors, USB connection issues, or flashing indicator lights—tell me what the printer is doing and I can help you troubleshoot further."

How do I initialize and clear the P-touch to factory default settings? | Brother

Reset your label printer

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Brother PTouch-P700 reset to factory settings - Google-

How do I initialize and clear the P-touch to factory default settings? | Brother