Use screen in securecrt on macos without HOME solution

This title is quite difficult to understand: When you use securecrt in mac OS, and then use screen to manage multiple windows on the securecrt logon system, by default, the screen uses ctrl-a to switch the window, and the linux terminal also uses this combination key to implement the HOME key function by default. In this case, the window can only be switched and the cursor cannot be directed to the beginning of the line.

In this case, you can only find terminal-> emulation-> mapped keys in session options, click [map a key], and then press cmd and the left arrow (why is this combination used? Because the mac system uses this combination key as the HOME address), the settings are as follows:

In this way, the HOME key function can be simulated when screen is used!