U4025QW PBP Main and Sub input and audio source assignment not remembered

I configured Input 1 (Main): Thunderbolt (Work PC) and Input 2 (Sub): DP (Personal PC), and the audio source is set to Sub.  However, every time I disable and enable PBP, the assignment was reverted to Input 1: DP and Input 2: Thunderbolt.  And audio source is back to Main.  Using Dell Display Manager or Monitor UI do not make difference.  The reason why Thunderbolt connection has to be on the left is that a second monitor for work and work laptop screen are on the left side of U4025QW. 

So this makes toggling PBP to a working state a multi-step operation.  I have to

Step 1: enable PBP (By the way, Display Manager does not provide a GUI and/or keyboard shortcut to toggle PBP, which is another inconvenience);

Step 2: do Video Swap (although keyboard shortcut is available, I have to use mouse or monitor (the location its joystick is not that great frankly) to do step 1 and that pretty much beat the convenience of using keyboard shortcut in this case); and

Step 3: go to monitor UI to set audio source to Sub (Display Manager does not provide this function).

Not make things smoother, there are couples of seconds to waiting for monitor finish in between thee steps.

Am I missing anything to let PBP remember a configured profile?  Thanks.