You need to activate Read Out Loud before using it.
- To activate Read Out Loud: select View > Read > Read > Activate Read.
- To deactivate Read Out Loud: select View > Read > Read > Deactivate Read.
Tip: You can press the shortcut key Ctrl + Shift + Y to activate or deactivate Read Out Loud, based on the current status of the feature. After activating Read Out Loud, you can read a PDF file and PDF form field out Loud.