How to revert from NewWorld Script to ExtendScript in Premiere Pro 2020

Premiere Pro 2020 (version 14.0.2 or later) has enabled the NewWorldScript engine. It has the following two issues:

• Logitech Options 8.10 with Craft Keyboard and MX Master 3 does not work at all for Timeline Navigation.
• Even after fixing the plugin code, the NewWorldScript engine is very slow (about x15) and is not usable for JogWheel. (Windows-only issue).

The following instructions are to help you revert to the old scripting engine as a temporary solution.

1. Launch Premiere Pro 2020.
2. Open the Console window:
   Windows: Ctrl + F12
   Mac: Cmd + F12
3. Verify the current settings:
   • Copy and paste the following text to the Command text field and then press Enter:
     debug.get ScriptLayerPPro.EnableNewWorld
     Note: Expected to be true,
4. Disable NewWorldScript and enable ExtendScript:
   • Copy and paste the following text to the Command text field and press Enter:
     debug.set ScriptLayerPPro.EnableNewWorld=false
5. Verify the current settings:
   • Copy and paste the following text to the Command text field and press Enter:
     debug.get ScriptLayerPPro.EnableNewWorld
     Note: Expected to be false.
6. Restart Premiere Pro 2020.
   • Quit the application.
   • If the Premiere Pro process is still running, end the process in Task Manager (Ctrl+Shift+ESC).

To reenable NewWorldScript as the default:

In step 3 above, set to True:
debug.set ScriptLayerPPro.EnableNewWorld=true

Reference:
New World scripting will be ON by default in the next Premiere Pro release!