Follow the directions below to hide any AAX 64 plug-ins (UAD or otherwise) from Pro Tools 11 and later:
First, navigate to the Pro Tools AAX plug-in folder listed below:
(Mac) Mac HD/Library/Application Support/Avid/Audio
(Windows) C:\Program Files\Common Files\Avid\Audio
Here you will see two folders - “Plug-Ins” and “Plug-Ins (Unused)”. All UAD plug-ins are installed to the “Plug-Ins” folder by default. To hide certain plug-ins from Pro Tools, simply move the plug-in to the 'Plug-Ins (Unused)' folder. The next time you open Pro Tools, only the plug-ins remaining in the “Plug-Ins” folder will show up in Pro Tools and any plug-ins moved to the “Plug-Ins (Unused)” folder will not be shown.