My keylogger checker found this what do I do about it?

It is a perfectly normal part of the system.

Any time you start ferreting around your system you are likely to find things you don't understand.

That does not mean there is anything wrong.

Do not install crapware like antivirus, cleaners or similar.

Keep your system up to date and do not disable its own security, like SIP.

SIP prevents anything - even the root user - from tampering with the contents of locations such as /System

You can rest assured that

/System/Library/PrivateFrameworks/ViewBridge.framework/Versions/A/XPCServices/ViewBridgeAuxiliary.xp

is safe and should be left alone.

As stated, it's a normal part of macOS and should be left alone. Your "keylogger checker" is reporting a false positive. Uninstall your keylogger checker.

When I double click on /System/Library/PrivateFrameworks/ViewBridge.framework/Versions/A/XPCServices/ViewBridgeAuxiliary.xpc it launches Quick Look Simulator, not sure what that is exactly.

My Key Logger searcher didn't list anything. Mojave Cache Cleaner.

https://www.intego.com/mac-security-blog/apples-quick-look-reveals-your-darkest-secrets/