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Define the accessibility

Go to the accessibility settings

[System settings] tab

Open the Settings Editor and go to: [Preferences] → [System settings] .
Go to the [Accessibility] section.

Enable a beep sound during toggling

Beep sound

Use the [Beep sound] setting to enable or disable the beep sound.
Click [OK].

Adjust the delay time of a button press

Delay time

Use the [Delay time for control panel buttons] setting to define the time after which a button press takes action.
Click [OK].

Enable the use of the mouse to operate the control panel

Use of mouse

Use the [Mouse usage] setting to enable or disable the use of the mouse.
Click [OK].

Adjust the aspect ratio of the control panel

Aspect ratio of control panel

Use the [Aspect ratio of control panel] setting to manually adjust the aspect ratio of the control panel. Change this setting only if the aspect ratio of the control panel is incorrect.
Click [OK].