Improvements to the main action button when its visible within the prompter

[Cuperino]

Is your feature request related to a problem or a limitation? Please describe...
Problem and limitation. The blue button and adjacent velocity buttons are way too close any and really way too close for use in a cheap desktop touchscreen.

Describe the solution you'd prefer

1. Use a separate button for going back to edit mode, and have the current button serve as Play/Pause while prompting. This would prevent accidentally going back to edit mode.
2. Add more space between the buttons
3. Have the ability to make the buttons bigger

Describe alternatives you've considered

1. 3-switch usb or bluetooth footpedal
2. Control through a remote control instead of a touch screen

Provide use examples

1. Use on a cheap 15.6 inch touch screen monitor..

Request based on forum conversations with user Mash: https://forum.cuperino.com/t/prompting-bar-controls/83

[Cuperino]

Buttons removed with transition to Qt 6. This issue is no longer applicable.