Windows 10: How to lock phone through phone companion casting?

How do you lock your phone when using it through your phone companion application on your PC?? That being when it is casting through your phone companion app and you are using it through PC. I have the option to lock my phone using my side button on my phone, what is the equivalent computer related command??

:)

 

Files on phone

Thanks for the response! Samsung Note 4, there is no error. As soon as I connect it via USB, a nag screen for Microsoft's Phone Companion pops up, it shows both the phone and SD card as empty. A second later, "Add your Microsoft Account", pops over it. I X out of that leaving the nag screen showing my Phone by name and level of charge along with "To see more info, unlock your phone." (It's not locked). This nag screen is prompting me to install Phone Companion. The phone is listed in File Explorer with no folders showing.

 

Your Phone Companion is working but often weird

Just more and more "historical" messages. Now, messages I write on the input panel on the right appear in the list on the left but the message I wrote doesn't appear on the right side panel, just more historical messages.

At least the thing seems to work. Sort of two steps forward and three to the left and back.

I wish someone who was a real coder would write a decent app like this, one that was, uh, tested and didn't have an idiotic name like "Your Phone Companion". SIGH.

 

Your Phone Companion issues

Trying to send attachment with Your Phone, won't go...





... send it via Google Messages, goes immediately...





... the Messages attachment shows up...





... but Your Phone still can't send it!!! *Confused