how you manage your pie when it is in the mirror ??
This is how I do/did it:
Go to your Pi Application Menu, scroll down to Preferences, scroll down to Raspberry Pi Configuration. In the window that opens click the Interfaces button. Enable VNC. Click OK. Your done with the Pi.
On the computer that you want to manage your Pi from, go to https://www.realvnc.com/download/viewer/windows/ (In this case it’s for Windows. Choose your platform). Download VNC Viewer. This will allow you to remotely administer your Pi, and your MM, without having to take your mirror down or bring a mouse and keyboard to your mirror. I was doing that for a while until I learned this.
There might be other ways but this is the way I do it.